Subtitled, "Yes, I'm a newbie, just started today, and that Prone Jackknife- oh, my!"
Little background on me- I'm almost 41, been exercising sporadically for the last few years and more seriously for the past year. I lost 40 pounds last year and still need to lose maybe 40 more. I haven't done much in the way of weight training at all until quite recently, and even then, it was mostly Barbie weights.
So, as far as the prone jackknife goes, I can just about hold the push-up position with my feet on the ball. Any sort of movement from there caused an alarming twinge in my lower back, so I did not persevere.
Any ideas as to where I should go from here? Interestingly, the push-ups (done at 60º) went okay. I've been doing bent-knee push-ups up until now. This time last year I couldn't do a push-up or hold a plank position properly, so I know I am making progress.
I appreciate any ideas and thoughts about this. I only discovered this board a few days ago, and I'm impressed with the wealth of information and helpful people here.