I try to change up my workouts with different instructors, rotations and types of activity. It's hard when you love a certain instructor and someone like Jessica, you would think would have enough variety and balance. But, I suppose maybe the type of lifting, speed, or twisting of spine, hinged position, etc. can cause issues for a number of folks no matter who the instructor is.
I like both Jessica and Leslie, but don't want to place the blame on them solely. When we have favorite instructors we just tend to stick with them, but that can be problematic. I have felt hip pain from only doing Leslie workouts for about a month. It's the repetitive nature of her basic four steps, usually. And, she has so many workouts so I have a lot of variety to choose from. What works best for me is to walk every other day (with Leslie) or change up the type of cardio (walking or instructor) I'm doing. I also have foot issues, so know this is going to kill my feet if I don't switch things up. I was also doing a lot of treadmill workouts in the Spring and this didn't help, so I basically went back to my pilates (mat based) workouts. Next month it might be yoga.
It's tough, as we're all getting older and our bodies are not able to do what they once did. And, sometimes we push them harder when certain instructors motivate us. Do we need to lift as heavy as Cathe, Jessica, Kelly, etc.? Do we need to do three rounds of the same circuit of exercises? Do we need to finish the whole hour long workout? I'm doing gentler workouts these days, and liking how I feel afterwards. I'm not giving up on the others, but will introduce them back in a few times a week.