Each leg must bear its fair share of the load to assure balance. I just accentuate the thickness of the weight training support, establish a sturdy dietary leg and use aerobics as a balancing pole to assure an upright, on-target position. Here I stray from the crowd.
Physical fitness is vitally important.
This doesn't make it bad. Make your choice based on time, needs, goals, equipment available and desire. Some folks love the high, the rhythm, the demand, discipline, socializing and the results. But, please don't let the activity become excessive or it may eat you up. There are, of course, those who absolutely hate the thought of running in place, the stationary bike and classes.