I've completed week 2 of our push up challenge. When I started I thought - oh this'll be easy, but it hasn't been... I've managed every session so far, and noticed a big improvement in my core, and my posture. I found the feet/knees push up the most challenging, feeling somewhat uncoordinated while doing them.
Like with C25K, I'm trying not to look to far ahead, and frighten myself!!
How are you getting on?