Cardio Pyramid and Leg Pyramid. Especially if you work out at home, these are some great sets to add in to your routine. For me, finding creative ways to get my cardio in is the hardest because I hate running!
The first one works if you just straighten your bottom leg and kick. The second one is great, but it hurts your pelvis bone, so get a yoga mat and support your pelvis instead of having your hands in front of you.