The MMA has the Octogan. Darts has "The Cage". This is an innovation invented here in Taiwan. Cage Training. It's simple. You enter the soft tip or steel board cage. You are not allowed to exit the cages until you set PRs or shoot 80% or better of your PRs in every practice game. Bob's 27, 100 at 20's, 50 at Bulls, RTW, CCU, BH RTW, Catch 40, Shoot Out, Count Up, 501, and 701.