Your machine should be loose enough to spin the crankshaft with your fingers.
If your machine is not walking properly, check that the ligaments are all oriented in the right direction. These machines can be unforgiving of assembly errors, but can be taken apart and fixed without too much trouble.
Rigorous exercise will also work out any kinks over time.
Misplaced hip shaft
The MCL must always be oriented correctly.
Incorrect orientation
Backward shins
