A 38-year-old fitness founder shares 2 habits she uses to build muscle

Morgan Kline, the cofounder of Burn Boot Camp, loves compound exercises like deadlifts and pull-ups. Morgan Kline Morgan Kline cofounded Burn Boot Camp with her husband, Devan Kline, in 2012. Kline attends Burn Boot Camp classes 4 to 5 times a week. She shared habits that help her build muscle, from a few compound exercises to a protein-rich diet. Morgan Kline grew up being active — she was a dancer and three-sport athlete in high school, playing soccer, volleyball, and basketball. It was w...