CrossFit, which is a mix of cardio and weight-lifting. It works for me because: it minimizes the time getting to and from; I can turn off my brain and just do what they tell me (no self-motivation required); I prefer boring and predictable to unpleasant (too hot, too cold, too rainy) and variable.
I have tried many forms of exercise, and I find what I'm doing now to be the least miserable.
I have tried many forms of exercise, and I find what I'm doing now to be the least miserable.