Which is your problem?
1) literally your feet are heavy and you cannot keep them raised relative to your legs/body
2) your entire body is rotating (your head goes up and your feet go down) but your feet and legs and body are static relative to each other
1) literally your feet are heavy and you cannot keep them raised relative to your legs/body
2) your entire body is rotating (your head goes up and your feet go down) but your feet and legs and body are static relative to each other