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I was an ectomorph. After a coupe of years of weightlifting I have gained some muscle as well as body fat. Now I am planning to lose body fat without sacrificing muscle. Is HIIT suitable for my goal?

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Hi and welcome to! Unfortunately your question is very unspecific and not detailed enough to give a meaningful answer. If you could add more details like your age, current weight(or BF%), target weight (or BF%), former weightlifting routine, planned routine (both weightlifting and HIIT), former and planned nutrition plan and basically everything you can think of that might be relevant gasp that would be great. Other than that, you might find the answer to your question by browsing through this site, as similar questions get asked (and answered) quite a lot. – LarissaGodzilla Jul 15 '14 at 13:52
Also as an FYI, the body classifications of ecto/meso/endomorph have pretty much been debunked. – JohnP Jul 15 '14 at 14:31
The HIIT workout is an anaerobic workout, such as weightlifting. I you lift, then just do some low intensity aerobic training for no more than an hour. If you don't lift, you could do HIIT but for no more than 20min. The real fact that will make you mantain or loose muscle is your diet. – masmic Oct 21 '14 at 10:18

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