The danger with alternative treatments is that they are often excuses for not doing what is necessary. Let's be specific. If you are 50 pounds overweight and your IOP is a bit higher than normal and you have early or no glaucoma damage, it is much more important to lose weight than to use drops. It is important because being overweight leads to high blood pressure, and that damages the vessels that supply the nerve. It is important because being overweight stresses the heart and takes blood away from the eye that it may need.
Exercise done to excess can theoretically damage the eyes by shunting away blood.
I don't think anybody has ever shown that, but it makes sense. Then you should make sure you get really well acclimated first. The people who usually get hurt by exercise are like the people who stay inside all year except for the 4th of July weekend, when they sunbathe for 12 hours. That's a super question, because if we could answer it for specific people, we could improve treatment. Before too long, there should be user-friendly ways to estimate blood flow.