How does TandemFit know what's at my gym?
Members who train there report it, one question at a time between sets, and gym owners can claim the gym to verify entries directly. Anything a single person has reported stays unconfirmed until others agree.
What happens when the rack I need is busy?
You get a swap that uses equipment the gym actually has, and it's tracked against the same lift, so your history and PRs stay continuous instead of splitting into two exercises.
Does it work for strength training specifically?
Yes. Sets, reps, supersets, RPE, rest timers, notes, PR tracking and reusable templates, with equipment context attached throughout.