This is what I understand to be true, please correct where I am wrong. 1. Sprints is more effective for endo and mesomorph body types. 2. steady state cardio is most effective for ectomorph hard gainer types. i could be classified as mainly ecto... hard to gain... small joints... small waist blah blah everyone knows wtf an ecto is. a couple weeks of steady state cardio on the elliptical has yielded me poor results for bf loss. (45 mins, 150-160 constant hr) Those who actually run sprints on a fairly consistent basis, would it behoove me to give sprints a shot as a superior form of fat loss? if so, what sprint setups would you recommend me, i would probably do this on a high school football field.