I don't think that is true whatsoever. There might be a few people in millions who absolutely can't do anything.

Everyone can exercise, no matter what condition: bad heart, missing lung, missing limbs, etc. There is some form of exercise that can be done. You name a condition, I'm sure I can find someone on youtube with that condition absolutely crushing a work out.

Very very few people are physically disabled to the extent that they can't exercise. I see people who walk with canes lifting weights. Water aerobics can also be a good option.

> a lot of people WONT exercise though

Honestly, considering the overweight and obese population is growing we have a problem with systemic overeating that needs to be corrected first. It doesn't matter how much exercise you do if you eat more than you need.