Join the 30-day high knees challenge to improve cardiovascular health and boost lower body strength. The high knee skips exercise will target your quadriceps, hamstrings, and calves while also engaging your core muscles. Performing 250 high knees a day for 30 days will not only help you to burn calories, but also improve your endurance and coordination. Start with a moderate pace and gradually increase your speed as your fitness level improves. Remember to maintain good posture and engage your arms for a complete full-body workout. As with any new exercise routine, be sure to listen to your body and consult a fitness professional if you experience any pain or discomfort.