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Improve your stride length while maximizing your acceleration and speed with the SKLZ ® SpeedSac Indoor/Outdoor Variable-Weight Sprint Trainer. The SpeedSac includes three durable weight bags, each of which can be filled with up to 10 lbs of sand for the ultimate lower-body workout. The weight bags can also be used during lunge walks for additional hamstring and quadriceps strengthening.
Proven to improve 40-yard dash time and overall speed by strengthening lower-body muscle groups
Recommended for multi-sport training
For indoor and outdoor use
Includes three durable weight bags, each of which can be filled with up to 10 lbs of sand (sand not included)
Includes instructional DVD and six-week progressive training workout plan