@kingryang is an animal. as he pivots his hips he's using his obliques, gluteus, and lats with each punch. i wish we could see his legs so i can describe which muscles are being used as he pivots to each punch. but the speed on this young man is pretty impressive.
Check out @badurgovislam and this impressive video. his flexors in his hands and forearms are exceptionally strong. obviously his lat strength is up to the standard. he's also chosen to use a very proprioceptive rich environment. all and all very cool video.
Check out this ridiculous hamstring development! this is @ifbbdandecker wow. so you athletes out there, if you want to sprint faster and be more explosives you have to work the posterior portion of your body. so basically, hamstrings are key.
Its never to early to teach the fundamentals to our children. it doesn't matter what it is. teach them young. if these two young men decide to take boxing all the way, i think it's pretty safe to say they will be phenoms in the ring. thank you @grandytwins_boxing for the lesson.