the pistons drive the crankshaft via the connecting rods, though on start up the starter motor drives the crankshaft in its proper rotation direction to get the ball rolling
That is dependent on the RPM of the crankshaft. The higher the RPM's, the more times per second the piston makes a full stroke.
A flight of stairs.TemperatureA Staircase
of course you can get back. if you dont have arms, then i see your issue. but people with all their limbs, can get up. unless youre like 90.