What it does
Multiplies the Speed you gain while training by 2x (Common).
How to get it
Trails Shop in the Safe Zone for $500, or Robux. Equip it from the Trail menu after buying, or it does nothing.
Pro tip
Equip it right after buying, then train on your treadmill. The cheapest way to double your training. Robux shortcut: Trail 1, 3 R$ (tier match is our best guess).