It is not a good thing i wouldn't suggest it. It is best to wait till after puberty!
You shouldn't take whey protein at such a young age my friend.
No, young teens (especially boys) are just beginning their growth. The practice will help make the teen a better, stronger person.
growth spurts usually stop at 18 so definetly
Lifting weights and doing cardio will never stop your growth it will actually help it. The hormone (GH) or Growth Hormone is produced from lifting weights because you are triggering the pituitary gland to produce the hormone from the exercise. Same goes with cardio. working out in the gym or running will not stunt your growth.
disapline
It is possible for a 14 year old boy to grow another 5 inches. Males typically stop growing by age 18.
Medical science is currently unable to predict eventual height with any certainty. The premise of how tall a person should be at a certain age is purely speculative, so it cannot be said that anything "hurt" some anticipated but unfounded expectations of growth. It is known that weightlifting, if done properly, does not stunt growth.
Weightlifting won't do much for an 11 year old, but it wouldn't hurt. You won't be able to bulk up until 14-18.
The boy will need to undergo some serious counselling.
Transform into a 6 year old boy.
growth
Find him a hot 19 year old girl