The first time I tried this move I felt areas of my glutes I had never felt before!
Start standing on the right leg. You are going to step back with the left leg (think of a lunge) but aim for the back right corner (like a diagonal lunge). Lunge as low as possible (ideally reaching down and touching the floor) then return to starting. For an extra challenge, stay on the same side for 8-15 reps or try lifting the leg to balance as you stand. Repeat on the opposite side.
Hope that makes sense!
Thanks for all of the posts- I love this website!