01
They ignore tissue capacity
Standard plans push through pain. Your coach programs a clear three-out-of-ten pain rule into every session so you load healing tissue while respecting its current limit.
This tendon strengthening program manages the training a clinician does not. You get graduated loading, four strength sessions, and sleep-led recovery, while your physician handles your medication and bloodwork.
Rebuild & Perform Coach is $19.99/mo · cancel anytime · secure checkout by Stripe

The problem
01
Standard plans push through pain. Your coach programs a clear three-out-of-ten pain rule into every session so you load healing tissue while respecting its current limit.
02
Fitness apps often cross the line into medical advice. Your coach programs your training and nutrition, leaving all medication, dosing, and bloodwork entirely to your physician.
03
Healing requires specific materials and rest. Generic plans ignore nutrient timing and sleep data, missing the chance to align your food and rest with tissue repair.
The method
01
Your plan loads tendons with isometrics and slow, heavy three-second lifts first. Sprints wait until the slow heavy work has been pain-free for two weeks.
RulePain above three during a set regresses that lift one stage.
02
The coach reads your wearable data and adjusts the daily plan. If your sleep or heart rate variability drops, today's session becomes a lighter movement day.
RuleLow HRV or short sleep on your wearable lightens the next session.
03
You get a daily protein target scaled to your bodyweight, spread evenly across four meals. The coach also programs collagen and kiwi an hour before tendon work.
RulePrograms exactly four meals a day with a daily protein target.
04
Your daily check-in tracks joint health and fatigue. If pain lingers or spikes, the coach pulls back the intensity before it becomes a setback.
RuleTriggers a deload if joint pain hits four for three days.
Your week
Sessions land on these weekdays; ask your coach in chat to move one or fit it to your clinician's limits.
Built to adapt
Connect Apple Health or Health Connect. When sleep, HRV or resting heart rate say you are under-recovered, today's session gets lighter. Planned deloads follow your coach's schedule, and you can ask for one in chat.
Travelling, sore, short on time, missed a meal: tell your coach at any hour. It rebuilds the week or re-portions the day, and confirms the change in chat.
Daily check-ins and progress photos go to your coach, and your plan is adjusted from what actually happened, not what was scheduled.
Is it for you
How this coach works
Your clinician manages your condition and any medication; your coach plans training and food inside the limits they set.
Independent public guidance on exercise for this situation. Listed so you can check it yourself; these organisations have not reviewed or endorsed Agents4 Fitness.
Not medical advice. Rebuild & Perform Coach provides fitness and nutrition coaching only. Talk to your clinician before you start, and stop and get medical help if you feel unwell while training.
Pricing
Create your account, check out with Stripe and answer a one-minute intake. Rebuild & Perform Coach writes your first plan before you sign in. Month to month; cancel in a tap.
Rebuild & Perform Coach
$19.99/ month
Secure checkout by Stripe · cancel anytime
Questions
Something else? Ask your coach in chat once you are in. It answers at any hour.
If you are dealing with an injury or taking prescribed substances, you need a clinician's clearance to load tissue. The coach handles the training, while your physician handles the medicine.
The coach programs exactly four meals a day. It provides a daily protein target scaled to your bodyweight and times your nutrients, like collagen, around your training sessions to support tissue repair.
Every loading session has a clear three-out-of-ten pain rule. If your pain goes above a three, you stop the movement. You can tell your coach in the chat, and it will adjust your upcoming sessions.
Strength sessions run just under an hour, and rest-day work takes ten to forty minutes. Low readiness or pain above three before a session swaps in isometrics and a daylight walk.
You simply tell your coach in the chat. It rebuilds your week, shifting your heavy days so you can get your four strength sessions in without stacking them back-to-back.
Your account is free — browse coaches, explore the app, and connect with a coach. Each AI coach is a monthly subscription (priced by coach); cancel anytime in a tap.
It's an AI coach built on a real training methodology for this exact niche. It writes your plans, adjusts them from your check-ins and progress, and answers questions any time — no waiting for office hours.
Your plan is built from YOUR intake — goals, schedule, equipment, injuries, preferences. If something doesn't fit, tell your coach in chat and it adjusts. And you can cancel any subscription anytime.
Your data stays yours. We never sell it, and you can export or delete your account at any time. See our Privacy Policy for the details.
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