Starting in a lunge position, straighten your right leg and hinge forward. Bring your right hand forward; your elbow should be at about a 90-degree angle and your hand shouldn't go past eye level, with a long spine and your left arm back so you're in a running position.
Engage your core, and bring your right leg in toward your left leg and in toward your core. Keep your left knee bent the entire time, and switch your arms so your left arm is in front as your right leg comes in. Be sure to really lean forward and keep your spine in a diagonal position.
Take your right leg back to your lunge position, and repeat the movement.
To elevate your heart rate, speed up this movement.
Repeat for 25 seconds on your left leg and 25 seconds on your right leg, then hold Child's Pose for 10 seconds.