This modified one-leg push-up will challenge your arms while working your abs. Actively squeeze the glute of the lifted leg to do even more work and tone up your backside!
Begin in plank with your knees on the mat.
Extend your right leg straight behind you so it's parallel with the floor. Engage your abs, and keep your left heel in line with your hips by engageing your glutes.
With your right leg extended, exhale to bend the elbows, lowering into a push-up. Inhale to straighten your arms, keeping your leg lifted.