Burn Boot Camp Co-Founder's Habits Fit Fitness Trend

Morgan Kline, co-founder of Burn Boot Camp, told Business Insider she strength-trains four to five times a week. She focuses on deadlifts and pull-ups, compound exercises that work multiple muscle groups. Her nutrition centers on whole-food protein at each meal, with chicken or beef, sweet potatoes and vegetables.

Kline co-founded the fitness franchise in 2012 with her husband. She said she no longer works out for appearance alone, training instead for longevity and daily function.

Apple's (AAPL) Watch is a leading fitness tracking device, with features that match strength training and health monitoring.

Kline said she has kept these routines for 10 to 15 years. "I try not to obsess about it," she said of protein intake. "As long as every meal can center around getting good, whole-food protein in, coupling that with carbs and fats."