My dad puts me to shame.
Now in his 70s, and after a little warmup he can put his hands flat on the floor, legs locked straight.
Golf and gardening seem to keep him going. 

 Standing up or sitting? Or both? 

It’s great that your dad is nice and healthy 

 Standing.
Yeah. He just never stops. He's always got some sort of construction project to work on, garden walls, fencing, decking. He loves physical work.
 

 Physical activity is longevity. That’s amazing man