Maximal step-up height as a simple and relevant health indicator: a study of leg muscle strength and the associations to age, anthropometric variables, aerobic fitness and physical function.
Really interesting in the light of the stuff I've had up before about floor living and another test for function - simply getting up off the floor.
All these things are tests - not exercises. But they are interesting toys to play with. If you can step up high, get down to and up from the floor then you are doing OK. If your training is retaining and promoting such function then you are going in the right direciton