Luxman
#TRE45ON
4 minutes is too long, I'm waiting for the 10 second workout "that really works!!!" 
Is sex or masturbation a "high-intensity interval" ???
http://well.blogs.nytimes.com/2013/06/19/the-4-minute-workout/?_r=0
Is sex or masturbation a "high-intensity interval" ???
http://well.blogs.nytimes.com/2013/06/19/the-4-minute-workout/?_r=0