Deltoid training. Find a dumbbell with the right weight. Let's get started.
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2. dumbbell side lift: lift the dumbbell from the side of the body with both hands, and the upper arm must be higher than the shoulder. Each group 10 makes 4 groups. Look at the schematic diagram here (/Yu Qiu hantan/album/item/90b08ff90d14952ed8f9fd0b.html).
Stick to it and it will work.