Cross behind, drop, and feel the glutes.
Keep your hips square to the front as you cross behind, don't let them rotate.
Stepping back and across behind your standing leg drops you into a lunge with a lateral demand the standard version never has, quads driving you up while the glutes on the front leg control the crossed-over line. The curtsy path takes the hip through ranges most lunges skip entirely. It builds legs that are strong outside the straight-ahead plane, which is where sport and life actually happen.
The cross-behind step. Instead of stepping straight back, the trailing leg crosses behind and across, which pulls the front-leg glutes into far more work and challenges your balance side to side.
A little wobble is the exercise doing its job, but the front knee should still track over the toes. Slow down, shorten the cross-step and keep your hips facing forward until it steadies.
Bodyweight is plenty to start, since the balance and range are the real challenge. Once sets feel smooth, holding load is the natural progression.
