The steady way back to running.

No. Rebound is a fitness program with walk/run sessions and strength work that adapt to what you report. It doesn't diagnose or treat injuries, and it doesn't replace your physical therapist or doctor. If you report a warning sign, Rebound pauses your plan and points you to a professional.

After a knee injury, yes: at intake you confirm that a physical therapist, physician or other qualified professional has cleared you to return to running, and you must be 18 or older. If you've had knee surgery recently, Rebound will ask you to wait until you're further along in healing. If you're not injured and are new to running or coming back after a long break, there is nothing to be cleared from: you confirm instead that you're not currently dealing with an injury, haven't had surgery on a knee or an Achilles in the last 12 months, and have been cleared for, or feel fully ready for, regular exercise. Either way, once you start you'll tell us how you feel before each run and after every session, and we'll pause your plan if you report sharp pain, swelling, a knee or ankle giving way, night pain, or pain that keeps building.

Before each run, after each session and the next morning you're asked one question first: any joint, bone or tendon pain, even mild? No is a 0. Yes asks how much, 0 to 10, and where. The rules in How it adapts above decide: 0 to 2 continues; 3 to 5 at your injured knee holds until the next morning's check and settles if the morning is back at or below where the run started; above 5 steps back at once; a 6 or more before a run or the next morning, sharp pain, swelling, a knee or ankle giving way, night pain, or pain that keeps building pause the plan. The 3 to 5 allowance belongs to the place you named at intake: your injured knee, or your injured Achilles. Pain of 3 to 5 anywhere else, on the other side, or on the stricter paths (IT band, an unspecified knee, a repaired Achilles rupture, or no injury) steps back right away and settles only at 2 or less. Muscle soreness in your thighs or calves doesn't count. AI never makes these calls.

Nothing bad happens: no pause, no step back. The check-in is open on the day after the run only, and a morning nobody answered is simply unknown, so that run doesn't count as one of the two clean runs you need to step up. The next pre-run check asks how you feel and decides whether that day's run opens.

Possibly, when a provider recommends Rebound for recovery from a specific injury and your HSA or FSA administrator approves it. Injury-related expenses are not limited to knees, but Rebound currently offers an injury intake and a Letter of Medical Necessity template only for knee injuries, Achilles tendinopathy and a surgically repaired Achilles rupture; the tendinopathy letter names the condition as you reported it at intake, for your provider to confirm. Your provider must review and sign the template if they agree. The no-injury path has no letter, and Rebound Training is a general fitness membership. A letter does not guarantee reimbursement.

For now, yes. Bring the letter to a doctor, physical therapist, or other licensed provider you already see. If you don't have one, we're working on a way for an independent clinician to review and sign it, and we'll update this page when that's ready.

You graduate once you can run 30 minutes straight at a comfortable pace. Some people stop there. Others move on to Rebound Training, a monthly membership that builds you toward your next goal, from a 5k up to a marathon. It still asks about pain and can ease your plan when needed.

Yes. You can cancel from the settings page in the app. If you cancel during your free week, you won't be charged.

Yes. Your plan, session logs, and notes are locked to your account, so no other user can see them, and we don't sell your information. Card payments are handled by Stripe, so your card number never touches our servers. We use Claude, an AI model from Anthropic, to personalize and explain your plan and structure free-text notes and plan-change requests. For that it receives your plan answers, the effort and pain numbers you log, and what you write. We never attach your name, email address or any account identifier to a language-model request. Anthropic doesn't use this information to train its models. You can delete your training data anytime from settings, and the full details are in our Privacy Policy.

Rebound Running LLC, based in Texas. You can reach us at ethan@reboundrunning.com.