

The simple answer is always antigravity aka magic. You could calculate the force of gravity acting on them and say that amount of antigravity plus the force required to accelerate them at the rate they accelerate including wind resistanceat the elivation they are flying, but you would need their mass and dimensions.
There are free clinics in some areas specifically serving these communities for this reason. Disproportionately impacted by thr disease, and more likely to be unable to pay due to economic disadvantage.