Triceps brachii: 4 groups of dumbbell flexion and extension.
Narrow distance push-ups 4 groups
Dumbbell neck and back arm flexion and extension 4 groups
The number of people in each group is about 8 to 12, and the weight of dumbbells is adjusted to 8 to 12. The rest time between each group should not exceed 1 minute. You can't practice every day.