Hi Product Hunt - I built SpotterFuel for a small but constant gym problem: the exercise you planned often depends on equipment someone else is already using. Instead of rebuilding the whole workout, SpotterFuel lets you pick the muscle and planned exercise, mark the station that is busy or unavailable, and get same-muscle swaps you can do now. The app covers 119 exercises across 17 muscle groups and 16 equipment types, with sets, reps, equipment, and cues so the replacement still feels intentional. What is live today: - iPhone app on the App Store - Same-muscle swap flow for crowded gyms - Focused exercise library - No account required - Free access to the best reroute, with an optional lifetime Pro unlock for the full reroute list I am especially looking for feedback from people who train at crowded commercial gyms: when your planned equipment is taken, what makes a backup exercise trustworthy enough to use right away?

SpotterFuel

Same-muscle swaps when equipment is taken

Same-muscle swaps when equipment is taken