TrainerPlan

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- New: history for every strength exercise. Tap "View history" under an exercise to see every session you've logged, with your estimated 1RM, heaviest set and most reps, and new records highlighted.
- New: RIR (reps in reserve) as a set parameter in strength workouts.
- Clearer message when your account isn't available, with a button to try again.
- Bug fixes and improvements.