Squats Stand tall with your feet shoulder-width apart. Bend your arms at the elbows and clasp your hands in front of your chest. Pushing into your heels, bend at the knees and sit back, as if into a chair. Lower yourself until your thighs are parallel to the floor. Push yourself back to a standing position. Perform 3 sets of 10 to 12 reps. Speed Skaters Start by swinging your right leg behind your left leg to cross your legs at the thighs. There should be several feet of distance between your feet. Pushing into your left foot, hop laterally, swinging your right leg forward so that you land on your right foot. Swing your left leg behind you, then hop laterally to the right. Repeat 20 times. Lunges Stand with your feet hip-width apart and your arms by your sides. Keeping your upper body straight, take a large step forward with the right foot and lower into a lunge, until your right thigh is parallel to the floor. Your left knee should not touch the ground and your right knee should not extend past your toes. Push off your right foot and return to starting position. Perform 3 sets of 10 reps on each side. One-Legged Hops Stand on your right foot. You left leg should be bent at the knee so that your left foot is hovering about a foot above the ground. Hop up and down 15 times on your right foot, then repeat on your left. Perform 3 sets total. Side Plank Side planks help to strengthen your core, a crucial component to running stamina. Lie on a mat on your side with your legs stacked. Prop yourself up on your elbow, making sure it is directly under your shoulder. Place your top hand on your top hip. Brace your core and hold for 30 seconds or as long as you can. Then, switch sides. Jump Squats Start with your feet shoulder width apart, arms at your sides. Bending at the knees, push through your heels and squat down until your thighs are parallel to the floor. Then, again pushing through the heels, explode upwards into the air and land softly in another full squat. Perform 3 sets of 10 to 12 reps.