The dorsal interossei pedis (intrinsic musculature of the foot) are stretched by adducting toes #3-4, and abducting in the tibial and fibular directions toe #2, at the metatarsophalangeal joints.

Stretching the dorsal interossei pedis. Top left: fibular abduction of toe #2. Top right: tibial abduction of toe #2. Bottom left: adduction of toe #3. Bottom right: adduction of toe #4.