SKLZ Chrome SpeedSac Pro-Variable Weight Sprint Trainer
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- Heavy duty belt with adjustable length leash
- SpeedSac Pro and four (4) weight bags with dual-buckle enclosure
- Loaded sprint training develops the gluteus muscle group
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Build explosive leg drive out of the blocks with the SKLZ SpeedSac. This variable weight sled allows you to strengthen your lower body-muscle groups by providing options for increased resistance training similar to metal sleds. You can also use the handles on the bags to execute lunge walk for additional hamstring and quadriceps strengthening.
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The one problem is the belt. The belt is sturdy, but too big to fit me snugly. I have a 32inch waist and the loop is under the strap when pulled tight, the velcro keeps it attached, but there's a gap and doesn't sit as snugly as you'd want. Skinny kids might have a bit more of a problem.