I agree that human bodies need mental and physicial stimulation.
Work is often onesided by the end of a career one is burned out on one and uncomfortable with the other.
Your idea is an improvement but i see no reason why producing economic value should be the only way one can be actively healthy.
Many people struggle to staying fit, to make full healthy meals because of theid work/life balance, this is return has an effect on how normally is shaped around our children who lack healthy examples.
Its been shown that when provided with more free time, extra cash. Most people will spend it on improving their health, balance and start builidnf new active habbits based on their own aspirations that can last long into elderhood. Like gardening.