Begin in Wide-Legged Forward Bend (Prasarita Padottanasana).
Bend one knee into a half-squat. Keep the opposite leg straight and flex foot so that toes leave the floor while resting on the heel.
There are a lot of options for arm variations. Keep hands on the floor if needed for balance. Otherwise, try bending elbows and bring hands into anjali mudra (palms together) with the elbow inside the knee in a kind of half Garland Pose (Malasana).
Drop hands to the floor for support if needed, and shift to the other side halfway through.