Thanks for posting this.
Most aerobic exercise requires a degree of balance, we are all different, and I can only relate my own experience. My Ataxia was diagnosed at age 70 although there were slight indications all of my life that balance and agility were not my strong points. Still, I was able to play competitive sports and excelled at some of them.
Within a year of diagnosis I was on a rollator and immediately tried to run behind it. I got about 50 yards before I nearly vaulted over the unit and realized that there was a reason that they are commonly referred to as walkers.
Since then I have been walking several days per week on indoor and outdoor trails and also using a rowing machine, a treadmill, and an elliptical machine. It took a while for me to be able to develop sufficient balance to get my heart into an appropriate training range. I know generally just walk as I find it less boring.
Seven years on my Ataxia continues to progress however very slowly I think to the surprise of my neurologist. In any case aerobic exercise is likely beneficial for those able to do it.