Difference between arm movements in butterfly and freestyle?

The swim.com app on my smart watch usually identifies my attempts at butterfly as freestyle. That prompts me to think that I don't really know what the difference in arm movement should be, apart from pulling with both arms simultaneously instead of one at a time.  What should I be focusing on with butterfly?  I try to do a thumb-first entry, and my pull is somewhat hourglass shaped. 

Parents
  • No comment on the app but alarm bells went off when you say you enter thumb-first. That's going to cause shoulder impingement problems for you at some point. Try to flatten the entry so that you are leading with all of your fingers to grab the water. 

  • Ah, thank you!

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