Improvements with drawing

I will need to work with more body forms and in order to do this Have to look at natural forms and do observational drawings of people, reason for this is because I need to work on body proportion because I seem to always have to keep redrawing and piece I do because the bodes  I draw are always inaccurate in their size and scale according to the realistic figures I look at. The only way will be able to improve is to practice and just say practice, actually attend life drawing classes and use books which work with drawing figures because the more I practice it will allow me to identify my faults physically and I can work on improving these problems.