In my ab workout I do a version of the high knee crunch, but it's in the plank position. Like being in a push up position and bringing your knee up towards your shoulder. I can't do a side plank because I'm too week, but I do moves in a variation position with my knee down. I hate exercising, but you know, my ass is looking pretty hot and I've cut 4 inches off my waist.
Also, Sophia, yes with HRT it's different, at least for me anyway. I have not experienced any sort of bulking up even though I'm working out more than I ever have in my life, but my muscle tone has really improved. It is hardest to lose the remaining fat on my sides, but I've gotten much leaner overall. I do think I've reached a point where I'm unlikely to lose any more weight, however that might just be my body's natural state. I will probably change up my routine in another 4-8 weeks and see what happens. I do female exercise routines.