BeatBudget
BeatBudget is a mobile app (iOS/Android) that auto-adjusts HIIT and cardio sessions based on how recovered you actually are. It connects to Apple Health, Google Fit, and common wearables to read resting heart rate trends, sleep duration, and recent training load, then assigns a simple daily “effort budget.” You get a 10–30 minute workout that fits that budget: intervals, steady-state, or a deload option when you’re cooked. The app is blunt: it will tell you to go easier when your data suggests you’re flirting with overtraining, and it won’t pretend every day should be a PR. Workouts are minimal-equipment (treadmill, bike, rower, or bodyweight) and come with clear pacing targets (RPE + heart-rate zones). Progress is tracked through consistency, time-in-zone, and repeatable benchmark sessions rather than vanity calories.