Muscle Gain Guide: Build Lean Mass and Get Ripped Fast

Building lean muscle mass effectively involves a combination of high-density training and strategic supplementation like whey protein or creatine. Discover why women should lift weights for fat loss and how to maintain muscle while getting lean.

Muscle Growth in Teenagers

Published Jul,08 2011 | By Mitchell Clark

When boys and girls reach puberty, an increase in hormone production spurs a rapid growth spurt. The growth spurt accounts for about 20 percent of the full adult height in both sexes. Teens will gain approximately 50 percent of their ideal adult weight during puberty, including an increase in lean muscle mass.