Hi dj_emerald, thanks for stopping by.
I mix my planks up quite a bit, on my hands, on my elbows I can only hold them with good form for about 20-30 secs, my core is my weakest part. They actually seem to be getting harder not easier, I'm hoping thats because my form is getting better :? I only do them about twice a week.
Re: the one legged squats don't be too impressed I only go to just below parallel and have the other toe down for balance. I just started doing them one day a week and as each week goes by I find I am relying on that one toe less and less. I also do these pretty slow.
Kevin posted a good tip for me that I haven't tried yet :oops: which was to do them on a chair holding onto my pullup bar for balance. Come to think of it hanging onto a bit of dowel would probably work too.
Give them a go, you might be pleasantly surprised.