structural:expansion, information:classification
Variable resistance training

Variable resistance training relies upon adjusting resistance for stronger and weaker parts of a lift. Any given movement has a strength phase sequence which involves moving through phases where a person is relatively stronger or weaker. This is commonly called a ‘strength curve’ which refers to the graphical representation of these phases. These phases are based upon related anatomical factors such as joint angles, limb length, muscle engagement patterns, muscle strength ratios, etc. Variable resistance training typically involves increasing resistance (usually weight) in the stronger phase and reducing it in the weaker phase. The additional resistance can be added through the use of chains attached to the barbell for a squat in the bottom portion of the squat reduce the overall weight. At the top portion of the squat, the chains are lifted from the floor to increase overall weight. Bands can be used to increase resistance in a similar manner. Alternatively, partial reps with heavier weights can be used in conjunction with full reps with lighter weights. Training both phases accordingly through variable resistance techniques can allow the muscles to strengthen in accordance with a person’s natural strength curve. It avoids a situation where, as a result of training, the weaker phase force potential is disproportionately great in regard to the stronger phase force potential. These benefits can help a lifter to become more explosive and to complete a lift.