I don't have vestibular migraine, but I have experienced vertigo and have a disability that affects my ability to exercise. It's hard enough to do "regular" things and take care of yourself at home while the world is spinning, so I give you credit for continuing to try and exercise.
While we wait to see what others have to say, my suggestion would be to have a few conversations:
1) Chat with your doctor to see if they have any particular suggestions or things you should avoid.
2) Is vestibular rehab a possibility for you? This is physical therapy that is focused on managing your symptoms and adapting to your daily routine with symptoms, so I believe they would be able to give you the best recommendations based on your needs, in a safe environment.
3) Assuming it's okay with your care team, maybe you could work with a personal trainer once you get a better sense of your triggers. Trainers are there to help you craft a customized routine and to make sure you have the right form to prevent injury.
What do you think? Please keep us posted on how you're doing and what does/doesn't work for you -- it's a big help to others who might be reading along. Good luck! -Melissa, team member