Is AI Rep Counting Accurate? Does It Replace a Personal Trainer?
AI rep counting works well for standard movements through a clear range of motion, and has specific, honest limits worth knowing.
5 min read
All English articles
585 articles from the Trainera blog in English, newest first: training, nutrition, fitness apps, online coaching and running a coaching business or gym. Written for personal trainers, online coaches, gym owners and people who train on their own.
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How to Stop Rounding Your Back on Deadlifts
A rounded back on deadlifts almost always starts in the setup, not the pull. Here is where to fix it.
5 min read
How to Fix Knees Caving In During Squats
Knee valgus during squats usually comes down to one of three fixable causes. Here is how to find yours and correct it.
5 min read
Best AI Form Checker and Rep Counter Apps in 2026
A look at the actual AI camera apps that count reps and correct form in 2026, what they can and cannot do, and how to pick one.
5 min read
Does a Rep Counter App Record Video? On-Device AI Explained
A camera rep counter needs to see you, but it does not need to send your video anywhere. Here is the difference between cloud and on-device pose tracking, what TRAI Vision saves and what it never touches, and five questions to ask any fitness app with a camera.
4 min read
Remote Form Checks for Online Coaches: A Practical System
Online clients train when you are not watching. A workable remote form system has three layers: real-time camera cues during every set, objective rep counts in the log, and a short scheduled video review. Here is how to set each one up.
5 min read
Push-Up Counter App: Count Push-Ups Automatically With AI
A push-up counter on your phone should count real reps, not half reps and head bobs. Here is how a camera push-up counter decides what counts, where to put the phone, which faults it calls out and a 6-week plan to raise your max.
4 min read
Home Workout With Your Phone Camera: Setup and 4-Week Plan
Your phone can count reps and call out form faults at home, but only if it can see you. This guide covers distance, angles, light and floor space, then gives you a 4-week, three-day bodyweight plan that progresses on clean reps.
5 min read
Which Exercises Can an AI Rep Counter Track?
A camera rep counter works best on movements where your whole body stays visible. TRAI Vision follows 902 library exercises and corrects form on 252 of them. Here is the list by movement family, the camera angle each needs and what is out of reach.
5 min read
AI Rep Counter App: Count Reps With Your Phone Camera
An AI rep counter follows your body through the phone camera and counts every rep out loud, so you never lose count mid-set. Here is how it works, how to set it up in two minutes and what it can and cannot see.
5 min read
AI Form Checker App: How Camera Form Correction Works
An AI form checker watches your joints through the camera and speaks one correction per rep. Here is what it actually measures, why it gives one cue at a time, what it cannot see and how to get useful feedback from it.
5 min read
How to Create a Personal Training Plan: 5 Decisions That Actually Matter
Building a real training plan means five decisions in order: your goal, weekly frequency, exercise selection, load progression, and knowing when to adjust it.
9 min read
Understanding Macros for Weight Loss: A Simple Starting Guide
What protein, carbs, and fat do for weight loss, why total calories still matter most while macro split affects hunger and muscle retention, a simple way to set macros, and common mistakes.
6 min read
Dairy-Free Protein Shakes: Best Options and What to Look For
The main dairy-free protein sources (pea, soy, rice, hemp, pumpkin seed, blends), how they generally compare to whey, what to check on a label, and a simple homemade shake recipe.
6 min read
Child's Pose: How to Do It and Its Benefits
How to do child's pose correctly, what it stretches (lower back, hips, thighs), when to use it between sets or as a cooldown, and modifications for tight hips, knees, or pregnancy.
6 min read
Tibialis Raise: How to Do It and Why It Matters
How to do a tibialis raise standing or seated, why training the shin muscle helps prevent shin splints and improve ankle stability, and how to progress from bodyweight to banded or loaded work.
6 min read
Cross Training: What It Is and Why It Works
What cross training means, why it lowers overuse injury risk and fills training gaps, a simple weekly split to try, and when specializing for a competition peak matters more than variety.
6 min read
Isometric Exercises: What They Are and the Best Examples
What isometric actually means, why joint-friendly isometric holds are useful for tendons and rehab, the best examples like wall sits and paused squats, and their main limitation.
6 min read
Reverse Nordic Curl: How to Do It, Benefits, and Regressions
How to set up and perform the reverse Nordic curl correctly, the quad and knee-tendon benefits of training this lengthened range, common form mistakes, and simple regressions if it's too hard.
6 min read
Tricep Extension Variations: Overhead, Skull Crusher, and Pushdown Compared
Overhead extension, skull crusher, and cable pushdown compared: how elbow and shoulder position change long-head emphasis, common mistakes, and which to pick.
6 min read
Tricep Dips: How to Do Them and the Most Common Mistake
How to do bench dips and parallel-bar dips correctly, what they work, the shoulder-rolling mistake that causes most dip injuries, and how to scale difficulty.
6 min read
Incline Dumbbell Press: Correct Bench Angle and Muscles Worked
The right incline dumbbell press bench angle is 15-30 degrees for upper chest emphasis. Setup, muscles worked, common mistakes, and training safely without a spotter.
6 min read
Dumbbell Romanian Deadlift: How to Do It With Correct Form
How to do the dumbbell Romanian deadlift: hip-hinge setup, how far to lower the weights, common mistakes like rounding the back, and dumbbells vs. barbell.
6 min read
Reverse Fly: How to Do It and Which Muscles It Works
The reverse fly trains the rear deltoids and upper back. How to do the dumbbell, cable, and machine versions, common mistakes, and why it balances out heavy pressing.
6 min read
Hip Thrusts: Proper Form, Muscles Worked, and Common Mistakes
How to do barbell and bodyweight hip thrusts correctly: bench and shoulder position, glute squeeze at the top, common mistakes, and how it compares to a glute bridge.
6 min read
Single-Arm Cable Row: How to Do It, Muscles Worked, and Common Mistakes
The single-arm cable row works your lats, rhomboids, and rear delts while forcing your core to resist rotation. Setup, form cues, mistakes, and how it compares to a two-arm row.
6 min read
Gym Machines Explained: A Beginner's Guide to Common Equipment
A plain-English guide to the gym machines beginners see most: leg press, lat pulldown, chest press, pec deck, cable machine, Smith machine, and others.
6 min read
Pec Deck Machine: How to Use It and What It Works
The pec deck isolates the pectoralis major with minimal shoulder/triceps involvement. Learn correct setup, common mistakes, and how it compares to cable flys.
6 min read
Deep Squat: Benefits, Mobility Requirements, and Safe Progression
A deep squat is fine for most people once ankle and hip mobility allow it without compensation. Here's the mobility prerequisites and a safe progression plan.
6 min read
Stiff-Leg Deadlift vs Romanian Deadlift: What's Actually Different
Stiff-leg deadlifts keep the knees nearly straight; Romanian deadlifts allow a slight, fixed bend. Here's which to pick for hamstrings vs lower back pain.
6 min read
Belt Squat: What It Is and Why Lifters Use It
A belt squat loads the hips, not the spine, by hanging weight from a belt. Learn who benefits most, how to set one up, and typical rep ranges to train in.
6 min read
Superman Exercise: How to Do It and What It Works
The superman exercise works the erector spinae, glutes, and hamstrings. Here's correct form, what it builds, common mistakes, and who it's good for overall.
6 min read
Pistol Squat: What It Is and How to Build Up to a Full Rep
A pistol squat is a one-leg squat to full depth. Here's the real prerequisites, a step-by-step progression, and who should hold off on attempting it for now.
6 min read
Calf Raises: How to Do Them and Which Muscles They Work
Standing calf raises train the gastrocnemius; seated raises shift the work to the soleus. Here's the form, common mistakes, and a real progression path.
6 min read
What to Test During a Sports Coaching Software Free Trial
What to actually test during a sports coaching software free trial: real athlete data import, payment flow, the athlete mobile app, support, and data portability.
6 min read
Gym Software: What You Need Beyond Booking and Scheduling
Booking and scheduling is only part of running a gym or studio. Here's what else to check for: billing, waitlists, staff payroll, retention tools, and reporting.
6 min read
What Multi-Location Gym Chains Actually Need From Management Software
What a multi-location gym chain needs beyond single-site software: centralized member data, cross-location check-in, consolidated billing, and location permissions.
6 min read
How Much Do Personal Trainers Make? A Realistic Salary Guide
What personal trainers really earn: gym-employed pay ranges, independent and online income, how session and package pricing works, and what actually moves the number.
6 min read
NASM vs. ACE vs. ISSA: Personal Trainer Certifications Compared
How NASM, ACE, ISSA, and NCSF/NESTA actually compare on typical cost, exam format, NCCA accreditation status, and which type of trainer each certification suits best.
6 min read
How to Become a Personal Trainer: The Real Steps
The real path to becoming a personal trainer: get certified, choose employed vs. independent, land your first clients, and know what it actually costs and takes.
6 min read
Trainera vs Sportin: Booking and Venue Software Compared (2026)
Sportin is a booking app where players find and pay for courts across a city. Trainera runs the whole venue: sessions and bookings from the phone in your own app, plus memberships, entry, the desk, fiscal receipts and coaching. Checked 30 October 2026.
4 min read
Trainera vs Andrea360: Gym Software Compared (2026)
Andrea360 is free up to 50 members, then 90, 130 or 190 € a month, with the member app and access control from 130 €. Trainera Starter and Core include them, plus fiscal receipts, online payments and AI training. Checked 30 October 2026.
4 min read
Trainera vs GoFitness: Gym Software Compared (2026)
GoFitness prices by active members and sells check-in, POS, fiscal receipts, lockers and online payments as add-ons per location. Trainera has a fixed price and includes them. A dated comparison, checked on 29 October 2026.
5 min read
Gym Software in Bosnia, Croatia and Serbia: 2026 Prices
A neutral comparison of gym software in Bosnia and Herzegovina, Croatia and Serbia: public prices, member limits, access control, member app, fiscalization and online payment fees, all checked on the vendors' own pages on 28 October 2026.
9 min read
Serbia Fiscalization and SEF for Personal Trainers 2026
In Serbia, a flat-rate trainer outside VAT is not obliged to use SEF, but every session and advance needs a fiscal receipt. The law explained article by article, with a table for trainers and gyms and the fines.
8 min read
How to Become an Online Coach in the Balkans and Get Paid
What you need to become an online coach in Bosnia and Herzegovina, Serbia, Croatia or Montenegro: qualification, business registration, a package, your first client and getting paid, step by step.
7 min read
Fiscalization 2.0 in Croatia for Personal Trainers
In Croatia, bank transfers have been fiscalized since 2026, and from 1 January 2027 flat-rate trainers issue eRačun to businesses. A decision tree for Stripe, the App Store, foreign clients and prepaid packages, plus the fines in NN 89/25.
8 min read
E-Invoicing and Fiscalization: Bosnia, Croatia, Serbia
All three countries require a fiscal receipt for a training session, but e-invoicing between businesses differs. An overview for Bosnia and Herzegovina (FBiH and Republika Srpska), Croatia and Serbia with articles of law and dates.
8 min read
About this archive
What is in the Trainera blog archive?
Every article the Trainera blog has published in English, newest first, 48 per page. Topics cover training, nutrition, fitness apps, online coaching, client retention and running a gym.
Do I need an account to read the articles?
No. Every article is free to read and none of them needs a Trainera account.
Can I read the blog in other languages?
Yes. Each language has its own archive with articles written for that language. Use the language list at the bottom of this page to switch.