I have one now!!!!!!
My right bicep has always had a little line when I flex where I can see the muscle definition, but NOT my left - no matter how hard I flexed, lol. But now after 3 weeks of the challenge I HAVE A LEFT BICEP!!!!!
Just had to share the excitement, haha.
Congrats!!! keep with it. . . you'll se muscles and definition you've NEVER seen!!