re: Waist circumference

quote:

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Are there any studies about optimal amount of muscle mass and BF% by age/height?

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here is a good series of articles from BM

Part 1
part 2 part3
part 4

4 part series. in the article is gives a link to a lecture by Dr Sullivan that is a good watch


another really good article from that crew that goes over the list of priorties to improve health
LINK

Strength and Cancer mortality


how to measure your waist correctly

the whole barbell medicine site with the articles is a great place to start when looking at all of this. have whole series on youth training, blood pressure, cholesterol, nutrition, training, aging etc that are all backed by studies which they list in each article.