Leg Strap is an accessory that comes with Ring Fit Adventure along with the Ring-Con. It is required to play the game. The Leg Strap is a strap made from elastic and Velcro which sits around the left thigh when in use. It contains a pocket which the left Joy-Con can be placed into. It is also used to track the player's movement. The strap will also be used for Nintendo Switch Sports in 2022.
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Here's The Biggest Thigh The Ring Fit Adventure Leg Strap Could