Its seriously healthy cuz you get that cardio in. If you are delivering instacart, you can even get a trolley so you can just walk without carrying something.I'm considering going this route. Probably saves a lot of money and better for your health.
Also, with grocery delivery such as Instacart, there really isn't much of a need for a car.
However, I myself deliver for Instacart, and found that I can make $1,000 a month by doing deliveries. Basically, I just work whenever I'm bored. Sometimes I need to go to the grocery store anyway, and so buying customers' groceries on the same trip and delivering them for $15-20 is a great way to make money.
Also, the lack of freedom from not having a car is something I may not get used to.
The only time I miss a car is when I have a vet emergency which is quite rare. Especially when it happens in the middle of the night.