Roll Over? Are you kidding me!

We started tummy time, putting Quentin on his arms like in the below photo. Since we started a few days ago he has rolled over every time. I can't believe it. He's a strong little guy. The pediatrician was amazed when he was lying on her lap on his belly at 5 days old and he picked up his head and turned it to the other side, so I guess I should have expected something like this. The first time I thought it was a fluke, but he keeps doing it. You can see him struggling to keep his head up here, this was a few minutes into the exercise.