Physical training that consists of alternating periods of high- and low-intensity aerobic activity.
Interval training can create mild muscular hypertrophy. Short maximal effort bursts works type 2 muscle fibers, which have the potential to increase in size. While this type of training can result in some muscle soreness and hypertrophy, most people will only experience muscle-sparing effects. This makes interval training a good selection for people wishing to burn calories without decreasing muscularity.