Lifehacker
shared a link post in group #Lifehacker
lifehacker.com
How to Change Your Muscle Fiber Composition (and Why You'd Want To)
Fast-twitch and slow-twitch muscle fibers have different jobs—here's how to train for each.
Comment here to discuss with all recipients or tap a user's profile image to discuss privately.
Embed post to a webpage :
<div data-postid="nwwwzr" [...] </div>