Negative Sets. Weight training works with and against gravity. The motion towards the bar in a pull-up is called the "concentric movement," while heading back towards the ground is an "eccentric movement," or the negative portion of the movement. Resisting the pull of gravity during the negative porting of the movement taxes the muscles in a different way Myofibrillar disruption following acute concentric and eccentric resistance exercise in stregth-trained men. Gibala, M.J., Interisano, S.A., Tarnopolsky, M.A., et al. Department of Kinesiology (Neurology and Neurological Rehabilitation), McMaster University, Hamilton, ON, Canada. Canadian Journal of Physiology and Pharmocology. 2000 Aug;78(8):656-61.. At the end of a long set, switch to just performing negatives (with a partner's help on the way up) or work towards getting those difficult bodyweight movements (like a pull up or dip) by only performing the negative of the movement. Sounds easy? Just try it!
Exclusion criteria included major diseases or conditions such as severe heart disease, uncontrolled hypertension, obesity, osteoarticular pathology, and neurological disease. Criteria were evaluated on the basis of clinical history, resting ECG, and physical examination. Participants maintained their lifestyles and were instructed not to take part in any other physical programs throughout the study. At the time of the initial design, the study consisted of a 12-week randomized controlled trial with a frequency of 3 times a week, 36 sessions in all, ending with a new assessment of their wellness and the potential persistence of the results on functional/physical capacities.