In addition, before starting upper limb exercise in the future, we must ensure two warm-up steps: first, warm up the whole body, first run on the treadmill for 5 to 10 minutes or run for one kilometer. Second, the deep muscle mobilization of the shoulder joint: use a light dumbbell (10lbs) to open the shoulder, keep the upper arm horizontally extended, and keep the forearm perpendicular to the upper arm. The forearm is slowly lifted from the ground level to the vertical angle, a group of 8- 10 times, and after four groups, upper limb strength training is started.
Good wishes!