Cut the features to three core functions: workout catalog, timer with interval control, and a basic progress log. Drop any fancy animations, social sharing, or marketplace options. Use a single screen per action, hide all extras behind a hamburger menu or gesture that’s rarely needed. Prioritise clean, high‑contrast text and large touch targets. Make onboarding one‑sentence: “Pick a routine, start the timer.” If you add a feature, ask yourself: does it shave seconds off a training session or just add visual noise? If not, kill it.