Tập thể hình. Cung cấp đủ nước cho cơ thể. Không hút thuốc. Bổ sung chất đạm.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
One of the best forms of exercise to treat tight skin is weight training. Doing deadlifts and bench presses builds muscle that can help skin look tighter around your stomach, arms, back, and thighs. Starting at about one or two pounds, lift regularly at the gym or at home. Aim for five sets of six to eight reps and make sure to engage in some light lifting and cardio to warm up.  Make sure to ease into a routine. Start with only light amounts of weight and work your way up. If you feel strained,