Just thought to add this over here as well, in case some are looking for ideas. PL's are using sleds like football players, to improve speed and explosiveness. This thing is a LOT harder than you would think, so one sprint will have you gasping!
One old Tire
One eye bolt, 3/8"
One wood block inside for eye bolt nut
One scrap piece of 2x10 inside
Some old cement weights or rocks
Tow strap or rope
Weight belt or cartridge belt
One old Tire
One eye bolt, 3/8"
One wood block inside for eye bolt nut
One scrap piece of 2x10 inside
Some old cement weights or rocks
Tow strap or rope
Weight belt or cartridge belt