tobogganer

Failure to use either sent the tobogganer into what pilots euphemistically refer to as an "out of control" situation.

Luis Carrasco (skeleton), a Mexican Olympic tobogganer (skeleton racer)

Forgive me, spinal column, he thought giddily, and then he kicked both feet from beneath himself, spun like a falling cat, and hit the smooth floor on his back, sliding like a tobogganer with the limp boy riding on his chest.