- to four-minute warm-up first and a similar cool-down afterwards.3 Get an unexpected bonus! You don’t just get stronger, but leaner, too. Alternating fast and slow running not only builds running strength and speed, it also burns more fat. What’s more
get stronger, but leaner, too. Alternating fast and slow running not only builds running strength and speed, it also burns more fat. What's more, according to a 2001 study in Medicine and Science in Sports and Exercise, alternating fast and slow
