Babies sleep A LOT (albeit not for long enough periods or during the hours of the day/night we might prefer), but believe it or not, they get a lot of exercise.
It's all relative, of course. While it doesn't look like much, every muscle moved takes a lot of effort on their part, meaning they spend much of their day exercising.
To illustrate the point, an adorable dad posted a video of himself "exercising" with his (even more adorable) infant daughter while she works on her neck strength.
Presenting: The Lilly Ann Workout!
It actually does look like a decent workout, even for a grown man. For the little girl whose neck hasn't gotten strong enough to support her own head yet?
Downright exhausting, we'd have to imagine.
Give dad credit for really committing to the "workout," too. Really working that core. Stay at home parents who don't have time for the gym, take notice!
More adorable kid videos below ...