Even if you're overweight, cycling a bike is very rarely a problem. I'm an active cycle campaigner so I am definitely more exposed to many types of cycle commuters, but I know many people who are overweight for whom cycling is their primary method of transport. At two of my friends have told me that they cycle because it is actually more comfortable than walking long distances for them. I personally have an injury which can make it tough to walk long distances, but which doesn't stop me cycling 10x that distance.

I also know several people who have various form of physical disability who cycle either totally normal bikes or ebikes, or adjusted (to different degrees) bikes or ebikes.

If we had better cycle infrastructure where I live (a relatively small European city), many many more people would release that they can get where they're going faster and cheaper on a bike than in a car, and have more fun while doing it. Even when it's raining.