Exercise covers many things, walking, stretching, running, jogging, weights, hand-weights, resistance-bands, all types of sports and everybody has to work out what they are able to do. Doing too much is just as bad as doing too little. Nobody is telling people that they only have to do 3 x 10 min walks, they are talking about exercise.........which may lead to 30 min or more walks.
The advice to split the 30 mins exercise each day is from today's HCP's, Physio's. Everybody considering taking up exercise has to consider what they are physically able to do. I know of some who are so unfit or immobile or have had a major operation that they might not be able to manage much more than 5 mins to start with. Then they build on that extending to 10, 15, 20 or 30 mins or more at their own pace.
Obviously some types of exercise are more difficult for some and indeed may not be appropriate due to some underlying condition or injury. Somebody who is confined to a wheelchair or housebound can only do 'chair' exercises in small segments, 5 or 10 mins at a time. People who are just starting out or are in later life and haven't exercised for many a year and maybe are unfit. They shouldn't try to do too much at first. They may also have their health to think of so should undertake the exercise after discussing things with their GP or other HCP's.
There are many who have difficulty walking for whatever reason, they need to start slowly and build on things. Not everybody is fit enough to do even a 5 min walk let alone a 30 min walk, or even run Marathon's. Some can only dream of that achievement.......
So, nowadays, the advice to split the exercise is good advice for many people......horses for courses, so to speak. :wink: