In 2025, people use AI as a fitness coach: lifters record sets and have Gemini 1.5 Pro extract JSON (exercise, sets/reps/weight) and form critiques, sometimes paired with TTS for live cues. Grok 3, ChatGPT, Claude, and GPT-5 generate plans—meal macros, 4–5-day routines, sprint modules—and adapt weekly from user feedback. Many prompt AI to act as a physical therapist: intake on goals, pain (1–10), injuries, equipment, and target activities; output step-by-step rehab with safety rules (e.g., stop if pain >4/10) and progress templates. Day to day, users request 45-minute beginner programs, troubleshoot lifts (e.g., overhead press), handle plateaus, and swap foods to reach protein targets; some report specific outcomes (e.g., glute activation) and let the coach remember sessions to adjust intensity. Privacy-minded prompts share age/sex/height/weight for treadmill plans while limiting other data.
🤖 ai summary based on 9 tweets
Stories from AI users. WhatsNextForAI curates public sources. No product affiliations. Opinions are the authors.
I hope people use AI more wisely. Ask them to HELP you without breaching your own privacy/data. I recently used ChatGPT to create a treadmill plan to avoid hurting my knees 😂😭 (I did tell them my age, gender, and height/weight). https://t.co/1TWqr6dge6
For the plan.. I've access to gym 5x per week. I asked ChatGPT to give me a workout plan. (With a mix of cardio, weights, endurance) And it gave me! Weekly workout plans.. Check. With daily cardio & daywise muscle workout. https://t.co/3yat7m4SvG
In a year and a half I haven’t been able to craft a workout where I could feel it on my ass at all. One week of ChatGPT’s programming and I can barely sit. Awesome
Gen AI is great for learning stuff, but it's best when you've already done some prior learning from traditional sources. I'm currently learning the theory, science, and practice of sprint coaching and training–some of you may have seen me document my return to track and field athletics in my new-ish publication. After reading quite a bit, watching videos, attending some basic courses, I started a chat with GPT-5. I explained my background, my skills, what I was looking for in quite a bit of detail. I chose certain paths I already knew I wanted to take. Then I asked GPT-5 to create my own personalised sprint coaching manual. And it did a great job (as far as I can tell) But here's how I plan to use it. I have a reasonably high degree of confidence that its output is good and reliable–my prior reading and learning about this topic allows me to make this call. However, I now plan to go through the 22 modules GPT-5 created for me, study them, and corroborate each topics with existing literature. This type of learning is the best of both worlds. Here's this 22-module spring coaching module delivered to me by GPT-5 following my specifications. This is the raw output, with no editing, and the usual caveats apply: https://t.co/rJV8WnGD95
when i posted this, a bunch of people got curious how it actually works. it’s just claude or gpt acting as a hyper personal fitness coach… fully adaptive, remembers past sessions, adjusts intensity, & keeps things fresh. i dropped a quick writeup with step-by-step setup below. better than 99% of fitness apps right now, & it’s so simple.
Chatgpt can tell you how to get in shape if you ask. You have a personal trainer on-call 24/7 "I want to start lifting but I only have 45m a day, make me a beginner routine" "overhead presses never feel good, is there a common error I might be making? Or can you suggest alternatives to substitute in my routine?" "my weights didn't go up this week like last week, why?" "I need more protein but I struggle to eat 3lbs of chicken a day, is there something that's easier to eat?" Never been easier to get jacked. Billions of years of broscience at the tip of your fingers It's less good at telling you how to lose weight cuz it's scared to say "drop carbs or just stop eating" but you also don't need a personal trainer for that bc I just told you how Make sure you're sleeping enough too
Grok, act as my personal AI physical therapist to design and manage a precise, evolving therapy plan. Start by asking me targeted questions to gather all necessary context, such as: 'What’s your exact goal (e.g., reduce knee pain from 6/10 to 3/10, walk 20 minutes without limping)?’, 'Describe any injuries or conditions (e.g., location, pain level 1-10, sharp/dull, triggers, duration)’, 'What’s your fitness level (e.g., sedentary, walk 30 min/day, athletic)?’, 'What equipment do you have (e.g., none, bands, 5-lb weights)?’, and ‘What daily activity or movement do you want to improve (e.g., climbing stairs, bending)?’. Using my responses, create a detailed, safe, and beginner-friendly therapy plan with step-by-step exercises (e.g., ‘Sit, extend leg straight, hold 10 seconds, 8 reps, rest 30 seconds’), including warm-ups and cool-downs, sourced from the broadest and deepest resources like web searches, textbooks, articles, published research, and X posts. Set a 4-week timeline for my goal, asking weekly follow-ups (e.g., ‘Rate pain now, any exercise issues?’) to adapt the plan. Provide a progress template (e.g., ‘Day X: Pain Y/10, Activity Z minutes’) for me to fill out. Emphasize safety: start low-intensity, stop if pain exceeds 4/10 or feels wrong, and consult a professional for worsening symptoms or doubts.”
Grok 3 is quite good at making meal plans, calculating macros, and workouts It's at the level of being a competent AI personal trainer, nutritionist, lifestyle coach Once it has video capabilities for exercise tutorials, it's game over for 90% of the fitness industry
I recorded myself lifting weights. I fed the video into Gemini 1.5 Pro and asked it to write JSON for each exercise’s name, set count, rep count, weight, and to generate form critiques. Worked perfectly. Hook it up to a camera + TTS and you have an AI personal trainer. Wild. https://t.co/m3OJuUk5dU