Ring Fit Adventure is an exercising sports game developed and published by Nintendo for the Nintendo Switch. The game comes with two physical components: the Ring-Con, a flexible, hard-plastic ring that one Joy-Con slots into, and a Leg Strap that also holds a Joy-Con.
The game's main mode has the player complete a turn-based role-playing game, where player movements and battle actions are based on performing certain physical activities using the Ring-Con and Leg Strap, with the motion controls within the Joy-Con sensing the player's movement. Other modes include general guided fitness routines and minigames. These activities are centered around common fitness exercises, making the game part of Nintendo's "quality of life" goals in line with a similar game of theirs, Wii Fit.
Source: Wikipedia, "Ring Fit Adventure", available under the CC-BY-SA License.