well I would argue that other benefits of exercise cannot be simply ingested.
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.
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.