First of all, the warm-up serves a couple of purposes: to warm up the muscles, tendons and ligaments (soft tissue stuff) and second, to practice the movement before the set gets heavy.
Starting with lighter sets and progressing to a heavier set enables the athlete to practice the range of motion, and to prepare the motor pathway necessary to execute a movement in a mechanically efficient, and hence safe, manner. Here are some examples:
front squats
2x5 x 45
1x5 x 70
1x2 x 85
3x5 x 125
deadlifts
2x5 x 85
1x5 x 120
1x2 x 160
1x5 x 190
squats
2x5 x 45
1x5 x 75
1x2 x 135
3x5 x 160
hmm - interesting! with the shorter sets in the middle - i look forward to trying this out!
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