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Start with body weight then add small weights.
You definitely do not need any of that crap. Keep it simple. Put a bench behind you and you are good to go. Also, keep your weight lighter for now so you can fix your form issues.
Perform box squats by using a wide stance with your feet slightly beyond shoulder-width apart. Take a deep breath, brace your core, and unrack the barbell. While resting the barbell on your upper back, lower your body until you are sitting on the plyometric box at the bottom of the squat, then return to standing.
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