From the Super Mario Wiki
“Collect as many coins as possible! They'll refill your Power Meter. You can check to see how many coins you've collected in each of the 15 enemy worlds. You can also recover power by touching the Spinning Heart. The faster you run through the heart, the more power you'll recover.”
The Spinning Heart 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 in proportion to 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.
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