1. Stand in a doorway with your feet hip-width apart and your arms extended straight out in front of you, gripping the doorframe on either side.

2. Engage your core and glutes to maintain good posture and stability.

3. Slowly pull your body towards the doorframe, bending your elbows and keeping your upper arms close to your sides.

4. Pause briefly at the top of the movement, squeezing your biceps.

5. Slowly lower your body back down to the starting position.

1. Stand straight up with your arms relaxed by your sides.

2. Keeping your arms straight, raise them overhead and slightly out to the sides to create a Y shape with your body.

3. Hold the Y position for a few seconds, then slowly lower back down to the starting position.

4. Repeat for the desired number of reps.

5. To increase the difficulty, you can hold light weights or resistance bands in your hands during the exercise.

1. Lie on your side with your legs bent at a 90 degree angle, and your bottom hand grasping your thigh.

2. Curl your bottom arm to raise your upper body off the floor by pulling on your thigh. Focus on the bicep contraction.

3. Pause briefly at the top of the movement, squeezing the bicep, and then slowly lower your upper body back down to the starting position.

4. Repeat for the desired number of reps before switching sides.

1. Grab a towel, t-shirt, band, or any sturdy, lightly-stretchable object you can pull apart without ripping. Try to rip the object apart with both hands.

2. As you maintain tension, keep your arms straight and raise your hands up in front of your body all the way overhead.

3. Reverse the movement, still maintaining tension, until your hands lower to the starting position.

4. Repeat for the desired number of repetitions, maintaining tension throughout.

1. Start in a push-up position, but resting on your stomach, with your hands underneath your shoulders and your toes pressed into the ground.

2. In a controlled movement, push yourself back toward your heels, creating a partial downward-dog position. Pause only momentarily.

3. Push from your toes to extend your body forward until you are in a high plank position.

4. Lower yourself to the starting position.

5. Repeat for the prescribed number of reps, pausing briefly between each rep.

1. Begin in a quarter-squat position with your feet shoulder-width apart.

2. Maintaining the quarter-squat, jump your feet out to much wider than shoulder-width apart.

3. Quickly jump your feet back to the start position, and repeat the movement in rhythm, maintaining the quarter-squat position throughout.