Spare Atreq Harness + Lead for use with Atreq Speed Sled(ATQ102). This straight line training device creates resistance helping improve acceleration, stamina and leg drive. Spare Atreq Harness + Lead Spare Atreq Harness + Lead for use with Atreq Speed Sled This straight line training device creates resistance helping improve acceleration Simply add weight to the sled and experience top speed resisted sprinting for unmatched power gains explosive starts Note: Spare Harness + Lead only (sled sold seperatley) Simply add weight to the sled and experience top speed resisted sprinting for unmatched power gains explosive starts, speed increases resistance by adding additional weights can also be used on a variety of ground surfaces including grass, astro turf, and indoor floors (with a towel underneath).