Answer:
Double dutch :3
Arteries might be the answer
The 20 minute physical activity I performed was doing yardwork. It was fairly easy to do, besides a lot of bending down involved to pick up sticks. I did it in my front and backyard for a bit over 20 minutes, and no one did it with me.
Muscle movement.
Explanation:
I hope that helped you.
grrrrrrrrrr EAT
hehehehehe
