The Speed Chute by SKLZ is intended strictly for use on the X-axis. It generates progressive resistance during running that helps athletes and individuals improve speed, stamina, strength, and acceleration. Depending on the runner's speed, the Chute will add an additional 15 to 30 pounds of resistance. It also includes a quick-release buckle for those who want to practice explosive breakaways after establishing a stride. What definitely doesn't work is doing it with a cut-up garbage bag tied to my back. What would be cool is if I could use the Speed Chute to run from my mama's front entry vestibule, down the hall, through the living room, out the sliding doors, and off the back deck, and then float peacefully and unharmed 12 feet down to the sloped grassy knoll below. I don't know if that would work though.