Pullups and chinups build strength in your upper body, especially the lats and biceps. They are both very difficult to start doing but they are excellent ways to train for boxing. Pullups are harder because your arm muscles can't help your back muscles as much in this position.
Multifunctional Pull up Bar by JP, Wall Mounted, 3 Foam Padded Hand Grips for Extra Comfort, Chin Up Dips Station, Gym Workout Boxing Punch Bag Hanger, Pull-Up Bars - Canada
Chinups & Pullups, Thornton Gym Adventure Fitness Athletic Club
Which exercise is more difficult, pull-ups or chin-ups? - Quora
Wide vs Close Grip Pull Ups: Which is Best?– Sweat Central
The Fighter Pullup Program Revisited
Fitness livestrong
Bodyweight & Weighted Pull Ups for Greater Punching Success – Clinch Gear
Improving Pull-up ROM - StrongFast Fitness
Everlast Chin And Sit Up Bar – Everlast Canada
Do Pull Ups Work Triceps? [Sports Science Reveals the Answer], by Aqfsportscom