Inclusion Criteria:  18-30 years of age currently engaged in some form of resistance training between 1-3 times per week must have been training aerobically, but no more than 3 hours a week for the past six months  Exclusion Criteria:  Must not have had any surgery of the lower limbs within the past 1 year period Must not have any neuromuscular disorder (e.g., Muscular dystrophy etc.) < 76 inches tall (in order to fit on the training machine) Maximal strength of < 725 lbs for the eccentric training device If any of the subjects are pregnant or plan to be pregnant in the duration of the protocol.  For those randomized to the BFR group, if any of the subject's thighs are too large for the BFR cuffs (greater than 68 cm).