Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back, knees bent, feet flat. Hold a weight plate/dumbbell overhead. Engage your core, lift shoulders and upper back off the mat, keeping arms straight. Hold briefly, then slowly lower. Repeat.
Keep arms straight (not locked). Engage abs, avoid using neck or arms. Exhale on lift, inhale on lower. Start light, focus on form. Control the movement.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.