5 Handstand Push-ups
10 One legged squats, alternating
Scaling up the typical workout "Cindy". If you cannot do the movements listed above, spend a few minutes developing a pistol using a box squat progression, and practice some handstand holds or some partial HSPU to an elevated ab mat. Then go for a new PR on "Cindy" after some brief fatigue and skill development to enhance the typical Cindy Stimulus.