Four By Four Running app for iPhone and iPad
4.2 (
2992 ratings )
Health & Fitness
Developer: Anders Schau Knatten
Free
Current version: 1.0, last update: 7 years agoFirst release : 22 Jun 2017
App size: 6.31 Mb
Four by four is the scientifically proven[1], efficient way to get in shape quickly. It works both for athletes and couch potatoes.
You alternate between running quickly for four minutes and slowly for three minutes. You do four repetitions, for a total of 28 minutes.
[1] Aerobic high-intensity intervals improve VO2max more than moderate training, Helgerud et. al., 2007