High-caliber players bend more, not less
On-ice kinematic analyses show that high-caliber skaters use a greater range of motion at the hip and the knee than low-caliber skaters, which lengthens the stride. More flexion before the push means more extension range available, so more force produced in the push-off.
Upjohn, Turcotte, Pearsall, Loh, 2008, Sports Biomechanics · Buckeridge et al., 2015, PLOS ONE