Welcome to TE!

I still have a death grip on both my MTB and road bike. I wish I could not scrunch up my shoulders and waste my energy.

As to the butt and legs getting bigger, I guess you'll have to see how you like the look of women biker butts and legs. It's true about the muscular thighs.

But then again, a lot of TE members have lost lots of weight because they fell in love with biking. So, in the end, their butts and thighs are still much smaller than before.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle
2010 Santa Cruz Juliana with R kit and Crampon pedals
2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle (sold)