Front Crawl holding hand in front?

Hi all,

I'm new to swimming and learning front crawl. I can do about 1.5k in 40 m, which at that pace I go for a while, but my friend told me that my technique is off. He says that when I place my hand forward into the water, I'm meant to hold it there until my backhand reaches out in front as well.
I tried this method and I feel much more tired, especially from holding my hand forward my front delt is sore. Any ideas why this technique is the proper form, or am I doing it wrong perhaps and becoming tired as a result?

Thanks.

submitted by /u/2Broke4Skins
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