Hide all distractions. If you are using a full-body model, lock the shoulder and wrist. Only allow movement at the elbow or knee.
Best for: Physical Therapists. This is a vintage but effective tool. It allows you to click on any muscle (e.g., the deltoid) and see a line drawing of the joint angle change. It is not "gamified," but it is interactive and free. You click "Push" or "Pull" actions listed in a sidebar, and the graphic redraws the joint position. joint push pull interactive free
Each tool in the JPP suite plays a different role in the design narrative: Joint Push Pull (The Original): Hide all distractions
A tool visualizes this antagonistic relationship. If you slide a force vector bar to 100% "Push," the model shows the triceps firing and the elbow straightening. If you slide it to 100% "Pull," the biceps bulge and the elbow bends. The magic of the interactive element is seeing the co-contraction —when both sliders are at 50%, you see joint stabilization. Best for: Physical Therapists