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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
Adjustable weight options for variable weight resistance
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 (30 lbs total; sand not included)
Adjustable leash length to accommodate all athletes of any size
Country Of Origin: China
Rated 4.5 out of 5 by 2
Rated 5 out of 5 by running man running
this is a great home exercise equipment i use it and i can run faster thn befor it is durable
July 10, 2012
Rated 4 out of 5 by doble a cool beans
Speed training everything you have to fill it up your self
August 18, 2011