Explain

An ectomorph is usually tall with small bone structure high metabolism and better at endurance type of activity, they also find it hard to gain appreciable muscle mass (skinny person). An Endomorph has a slower metabolism and neither gains muscle mass easily or loses fat easily(fat person) A mesomorph has an athletic build and gains muscle mass more easily and can be classified as an easy gainer ( athlete) These are not set in stone as everyone has a verying degree of slow twitch to fast twitch muscle fiber and shouldn't use these as guidelines or excuses. See also BMI,haha.
 
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