Found in 1 comment on Hacker News
vl · 2019-07-25 · Original thread
I just do stretches for the muscles I'm training.

This is good book:

https://www.amazon.com/Stretching-Pocket-Book-Bob-Anderson/d...

This strap is really helpful:

https://www.amazon.com/gp/product/B00065X222/

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