I also need to work on my big girl push ups. I can do lots of the bent knee ones but there is some weakness somewhere in my body that causes me to really struggle with the straight leg ones. Right now I am doing the upper body weights premixes from 4DS (the one were the chest and back are split up onto two separate days), doing B&Gs Leg Blast premix once a week and running three days a week. I will probably do an occasional step and kickbox workout when it gets closer to the RT to keep myself in practice but I am not really doing anything special to prepare for the RT.