Feet

[u/fhashaww]

Are my legs supposed to be firmly planted or move slightly with the action? Sometimes i get slight backpains when i firmly plant my legs and go running the next day, but no pain during running when my legs are moving slightly during sit ups the previous night. I do sit ups at night and after running in the evening

[u/[deleted]]

I would consider planted not overly moving several inches as in using them to gain momentum to move.