Time to burn your core!!! There are so many variations of the plank, but one of my favorite go-to's is doing the plank, but alternating how you support your upper body with your hands and elbows. The key to this exercise is to try to keep your torso still while you throw off your stability by switching from your hands to elbows. NO ROCKING!
1-Start in the basic plank position, palms of your hands on the ground, directly under your elbows and shoulders. Keep your glutes, abs, and legs active so you have a nice flat back.
2-Lower yourself onto your elbows, one at a time, being sure you place your elbows directly under your shoulders.
3-Exhale and raise yourself back onto your palms, keeping them in line with your elbows and shoulders.
4-Repeat this alternation for 1 minute, being sure you a keep do not roll your shoulders out of line with your elbows, and keep your torso active!