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Pull-ups
Pull-ups are awesome. They work the back and some of the abdominals, too! It's also a great test of overall strength, since you're lifting your entire body.
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Deadlifts
I like deadlifts too. It works practically the entire body. But people can easily injure themselves if they're not too careful with their form.
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Protein Supplement
This is the best protein powder I've ever bought. It dissolves easily and tastes incredible. But it was $70 for 5lbs.
I'll probably stick to a cheaper brand.