CrossFit is a branded fitness system founded in 2000 by Greg Glassman and Lauren Jenai, promoting high-intensity, varied workouts across ~10,000 affiliated gyms in 150+ countries. It blends HIIT, weightlifting, gymnastics and more, aiming to prepare for unknown physical contingencies. Recent coverage touches on fitness-tracking apps and hybrid training trends shaping its practice.
Nutrition-tracking apps like MyFitnessPal and Noom use badges, streaks and rewards to boost engagement. While they can help with meal planning and activity reminders, researchers warn these features may reinforce body dysmorphia and disordered eating for some users, prompting calls for caution and better design.