The Spinning Heart is a helpful object that is found in Super Mario 64 and its remake.
It is a red translucent heart that slowly revolves on the ground. When Mario runs through it, the Spinning Heart will quickly replenish his Health Meter depending on the speed with which he runs through it. Thus, the faster he runs through it, the more health he recovers. In the remake of the game, Super Mario 64 DS, Yoshi, Luigi, and Wario can also use this object to recover their own Health Meters.