Sinking hips during recovery in fly

The greater the velocity (forward) the less you sink. But this is probably what you meant by flow dynamic. Yep, I think I just understood what you meant. I meant fluid dynamics :) sorry for the confusion, but you understood me anyway ;) I didn't know you knew about principle of physics that much. I voluntarily omitted one element that also brings you down because it does so through an esoteric weight shift, wait let me explain. On catch, if you press the water down, that brings the hip down. You get the same effect as if you were wanting to push against the side of the pool to exit and go home. Physics is my hobby. I made a couple of physics simulators, since I'm software developer. I was going to make a simple swimming simulator, but struggling with spare time at the moment, so it's going pretty slowly. In the effect above, I also see Third Newton, upper body tries to pull the arms closer to the body (against water resistance), but also arms tend to pull the upper body closer to arms. On the other hand, downbeat of legs kick tends to lift the hips, so probably it's about the balance between these two. But in your case, I'm absolutely convinced based on the timing during which the hip sinkage occurs that it has a lot to do with the leg recovery being too sudden and hard. Would you be kind enough to post a link? This is my eariler blog post with "above the water" footage of "legs only" exercise with arms in front: http://blog.grkovic.com/?p=18 http://blog.grkovic.com/?p=55 That's what took me so long :) I made some underwater videos. To me, the most relevant to this thread is the exercise where I swim without legs and when I manage to concentrate on relaxing the legs as much as possible, hips stop sinking. Or is it only me seeing ;) Thanks a lot for your time and advices. Best regards. - Predrag.

The greater the velocity (forward) the less you sink. But this is probably what you meant by flow dynamic. Yep, I think I just understood what you meant. I meant fluid dynamics :) sorry for the confusion, but you understood me anyway ;) I didn't know you knew about principle of physics that much. I voluntarily omitted one element that also brings you down because it does so through an esoteric weight shift, wait let me explain. On catch, if you press the water down, that brings the hip down. You get the same effect as if you were wanting to push against the side of the pool to exit and go home. Physics is my hobby. I made a couple of physics simulators, since I'm software developer. I was going to make a simple swimming simulator, but struggling with spare time at the moment, so it's going pretty slowly. In the effect above, I also see Third Newton, upper body tries to pull the arms closer to the body (against water resistance), but also arms tend to pull the upper body closer to arms. On the other hand, downbeat of legs kick tends to lift the hips, so probably it's about the balance between these two. But in your case, I'm absolutely convinced based on the timing during which the hip sinkage occurs that it has a lot to do with the leg recovery being too sudden and hard. Would you be kind enough to post a link? This is my eariler blog post with "above the water" footage of "legs only" exercise with arms in front: http://blog.grkovic.com/?p=18 http://blog.grkovic.com/?p=55 That's what took me so long :) I made some underwater videos. To me, the most relevant to this thread is the exercise where I swim without legs and when I manage to concentrate on relaxing the legs as much as possible, hips stop sinking. Or is it only me seeing ;) Thanks a lot for your time and advices. Best regards. - Predrag.