alright, four frames...

font leg:

1-leg bent, moving forward
2-leg extended, touching ground in front (not too far in front, though)
3-leg extended, some-what behind the center point of the body
4-leg contracted/bent, behind body (moving forward towards point 1)

front arm:
1-arm bent, mostly behind the center point of the body, but not by much
2-arm extended, almost limp, swung behind the body
3-arm semi-bent, mostly forward but still a bit centered
4-arm semi-extended, in front of the body

I'm just going through it in my head.. maybe I'll make an example,
but this is usually how I'd do it...

I'm sure you'd be able to figure out how to move the opposite limbs.

hope this helps.