2. The gym has special equipment to do pull-ups, and the effect is definitely the best. As for scientific exercise, it is almost the same as general strength training: 6~ 10 deep training for each group, 8~ 12 for each group, rest for 2~3 days after each training, and then do the next training after recovering muscles, so as to increase the intake of protein and ensure a healthy biological clock.
3. Push-ups are not helpful for pull-ups, mainly for triceps.
4, dumbbells will help, but the effect may be average, no one action can fully practice these muscles, it is recommended to practice pull-ups directly. Dumbbell optional movements: rowing (latissimus dorsi), sit-ups (latissimus dorsi, teres major), bending (two ends), arm flexion and extension (three ends).
5. Warm up for 5~ 10 minutes before doing it, jog and stretch your muscles. I never use any skills to do it myself. The key is strength.