A reverse lunge with a knee drive, holding the position, and pushing the knee into the hands activates the core, glute, and toes for balance.

“Peter's going to reverse lunge making sure to put most of his weight on the front foot being soft on the back toe then then he's going to drive his knee up hold that positional moment push his knee into his hands he's going to feel his core and his left glute squeezing and firing here his toes are working to balance”