how do you keep a toddler away from a treadmill?

hi guys i work out at home on my treadmill. i have a pack and play but he doesn’t seem to like it very much as he likes to walk around the house and explore.

any tips i can keep him from touching the treadmill while i work out?

i give him plenty of toys and stuff it’s just he likes to do his own thing. also i don’t have a baby monitor so i can’t shut the door and continue my work out.. sometimes i miss that newborn stage where they don’t move! lol 😝