It ain't just like running. It's something that needs endurance, something that needs stamina like long-distance running, cross-country running.
14 seconds sound clip from the Grease (1978) movie soundboard.
You can hear this line at 00:48:59 in the Blu-ray version of the movie.
Quote context
[...]
- Easy, easy, easy, easy. Put the bat down. Put the bat down.
- Now, there's a lot of other sports that don't have any contact at all.
- Come on. Keep those legs high!
- Danny, are you all right? Danny, talk to me.
- The least you can do is talk to me after the way you treated me.
[...]