Circuit 1, Exercise 1: High Knees Start standing with your feet slightly further than shoulder-width distance apart. Keeping the weight on your left foot, bend your right leg to bring your knee into your chest. Lower your right leg and plant your foot on the floor. Keeping your weight on the right leg, bend your left leg to bring your knee into your chest. Once you are comfortable with this movement, increase your speed so that you are hopping from one foot to the other. Repeat for 40 seconds, then take 20 seconds of rest. Image Source: POPSUGAR Photography