http://www.bbc.co.uk/news/health-30812439

No surprises here maybe. The Primal Blueprint prescription for general fitness, good health and optimal gene expression is:

– 2-5 hours low level intensity activity per week. In the aerobic zone 55-75% maximum heart rate.

– 2 strength training sessions per week of less than 30 minutes each. Intense enough that you cannot continue longer than 30 minutes maximum.

– An all out sprint session every 7-10 days when motivation and energy levels are high.

If you want to read the full report you can find it here

http://ajcn.nutrition.org/content/early/2015/01/14/ajcn.114.100065.full.pdf+html

(thanks to Prof. Ulf Ekelund for the link)