The answer to the question is practice! Don't worry if your results are not wonderful. Keep at it!
This series of drawings was done last night in front of the TV. I've never watched Dancing With the Stars before. My mother-in-law was looking forward to the new season. I had the urge to sketch, so began! I think the fellow in the first one came out best. It was fun to try to do them quickly! Since most of my figure work is done with nude models it was interesting to try to get the clothing in motion. I have a series of little dancers in mind for a glass project so it was good practice.