How do boys thin their arms and breasts with dumbbells?

Hello, the way to thin your arms:

1. Hold a dumbbell, a bottle filled with water (or sand) or simply use two bricks, straighten from front to top and then back, remember to do this next to your ear.

2. Put it down slowly and repeat this action 20 times. When you finish, your upper arm will feel sour. That's right. Do three groups every day, 20 times in each group.

Thin chest:

Put the dumbbell on your back, bend your forearm slightly, don't use too much force, just take it off, then open your arms horizontally, put them down upwards, use the strength of your chest as much as possible, feel the chest muscles pulled 20 times, and stick to it every day. I believe you will have a perfect breast.

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