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not until 23-25 years of age. it is very important that external hormones are not introduced before this age(ie testosterone or growth hormone). women will usually reach this point before men.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoBoys start developing muscles while still in their mom's uterus. But during puberty, the increase in testosterone cause a rapid increase in muscle mass. It is different for every boy. Some start changing sooner than others, and there is no real way of knowing when you will start. But once you have started puberty, it won't be long.
Wiki User
∙ 8y agoUsually around age 18 for males and 16 for females.
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What is the best safe way for a 12-year-old boy to get abs?
Doing sit-ups and crunches is the tried and tested exercises for developing abdominal muscles.
How do you do you know when you get muscles?
When you're self-aware. Everyone has muscles, it's just a matter of developing them.
What are effective exercises for developing tricep muscles?
eat chciken
Why do boy cats have nipples?
For probably the same reason that men do. All boys start out girls whilst developing in the womb and develop nipples before they are boys.
Do eggs start developing the day they are hatched or when they are put in an incubator?
Fertile eggs start developing when the hen starts setting, or when they are put in an incubator.
What is the first active step in exercising and conditioning of muscles is?
A. stretching.B. developing your muscles.C.contouring.D. learning to relax.
Are all baby boy then changes to maybe a girl the cells.?
No, all fetuses start out with the anatomical tissues that can develop into girls or boys. It is the combination of chromosomes (XX for females of XY for males) that develop those tissues into the fetus developing into a boy or a girl.
Where does rain start developing?
clouds, from evaporation
How can a 10 year old get muscles?
wait till you're at least 14 or when you start to hit puberty and then start goin at it hard...your body is still developing and nobody pays any attention to that when you're 10 years old, trust me... and If you don't wait you can seriously damage your body.
What is the right business to start up in the developing country like Nepal?
A production business is the right business to start up in a developing country like Nepal.
Is 121 pounds healthy for 13 year old boy?
121 pounds is equals to 55kg . As for 13 year old boy . You can say its healthy , as it can be counted as muscles if you have great body shape or quiet good muscles build . As muscles are heavier then fats .
What can you do to start breast developing?
Nothing, You'll have to wait.
