Squats are already one of the best all-around exercises you can do, and by raising your arms overhead, you engage your lower trapezius muscles (key for good posture).
How to do it: Stand tall with your feet hip-width apart. Bring your arms straight up overhead, palms facing in, drawing your shoulder blades down and back.
Shift your hips back and lower down until your thighs are parallel to the floor. Keep your weight in your heels, not on your toes, for the entire movement. Your torso should stay as upright as possible. Hold this position for 30 seconds to 1 minute. Push yourself back to the starting position. That's one rep. Do 3 reps total.
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