Sprint interval training

http://www.ncbi.nlm.nih.gov/pubmed/15705728

http://jap.physiology.org/content/98/6/1985.full-text.pdf+html

http://link.springer.com/article/10.1007%2Fs40279-013-0115-0

http://onlinelibrary.wiley.com/doi/10.1111/sms.12092/abstract;jsessionid=912E72122541793A7C76B3B93A8BB7EB.f04t03

http://download.springer.com/static/pdf/949/art%253A10.1007%252Fs40279-014-0180-z.pdf?auth66=1414690009_3e6e673df9729cf8c12c665170f861e0&ext=.pdf