Fast Twitch Muscles | San Francisco Fitness Expert and Fashion Blogger Jackie O.

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I took Killer Abs. . .I feel like in general I'm just more in shape and more aware of myself. My arms have really toned up and I can feel my abs getting tighter. Overall, it was a good class.

Kelsey Beerer Durham, PA

I took Killer Abs with Jackie O. Since the beginning of the class I've definitely noticed a difference. I feel like my upper arms are stronger and more toned and my abs though not killer yet, are definitely better than 6 weeks ago.

Meredith Pozzi Long Valley, NJ

I like this class (Total Body Makeover) because my body has become stronger, I lost 10lbs, and the muscle pains I often have without exercising go away with exercise.

Lauren Ward

I am taking a kickboxing class. I thought I was in pretty good shape before the class, but during the 1st class I realized that maybe I wasn't. For about the 1st 3 wee ks I was extremely sore after each class. Now halfway through the class I feel that I am in much better shape and am no longer struggling to walk up the steps in my apartment after class. I lost about 5lbs since starting this class and have gained a lot of muscles tone especially in my arms. Its was a really great class!

Caitlin Fulkerson, New Castle, PA

Slow Twitch and Fast Twitch Muscles

March 9, 2010

By Jackie O.

What's up ya'll? This is Jackie O. Today, I am going to explain the difference between fast and slow twitch muscles.

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