High-intensity Hypoxic Intervals
http://www.youtube.com/watch?v=q8X2jb918kM&feature=youtu.be J Strength Cond Res. 2012 Jan;26(1):94-105. doi: 10.1519/JSC.0b013e3182184fcb. Physiological strain associated with high-intensity hypoxic intervals in highly trained young runners. Buchheit M, Kuitunen S, Voss SC, Williams...