You don't have to jump out of the box like a jack-in-the-box. Take a peak out now and then. Stick a hand out, then an arm.
I used to shudder every time I was put in a situation that put me outside my comfort zone. Now, after a few good expereinces, I look forward to being "challenged" on a daily basis. Baby steps!
M42 W40 T17 M15 S13 S11 BD 7-14 A discovered 7-14 WAW moved out 10-3-14 D final 2-23-15