SKLZ Speed Sac - Variable Resistance Training.
Free UK Mainland Delivery
This is a great training aid from SKLZ. Designed to produce variable resistance while you run to increase fitness and leg strength.
Features & Benefits.
Includes 3 durable weight bags that can be filled with up to 10lbs. of sand (30 lbs. total)
Quickly improve your 40-yard dash time and overall speed and explosiveness
Safely strengthen lower-body muscle groups with multiple weight options
Adjustable leash length to accommodate athletes of any size
Adjust weight options for variable weight resistance