The are two schools... one says to draw VERY VERY much but fast... another one puts emphasis on doing it precisely and skill will come over time... I suppose they both work but develop other kind of skills first... the first method allows you to learn various poses fast and well, yet doesn't teaches you any good technique... the second one teaches you the techniques, then the anatomy.

I think it varies from person to person, skill level, attitude etc.
For me I never rush my stuff but i find out if i takes too long to get a basic body down; I try a different angle. i focus on specific areas of why the body looks weird.