I had my second baby 4 months ago and things still aren't quite strong enough for star jumps and high knees, I can just about manage squat thrusts though. I find I'm doing all of the cardio on the lowest impact possible or just repeating the same ones that don't send me running for the bathroom!
I need to get out of breath and I'm starting to get frustrated now. I can't fit a bike in my sitting room so if anyone has any ideas I would be very grateful.