He's so irresponsible doing that! I hope it's a one off and he's not going to encourage her anymore. Children have died using and playing with treadmills including Mike Tyson's 5 year old daughter. Surely with his profession he should know it's the wrong thing to do.Or just take her outside for a walk ? Why would a 1 year old need to learn to use a treadmill ?
(My kids like to put cars down my dad's treadmill )