People who are less fit need to do slightly more exercise than those who are very fit to get the same cardiovascular benefits, the study suggests.

The researchers say that the current one-size fits-all advice on exercise may need to be changed and replaced with personalised targets according to an individual’s fitness level.

That seems reasonable. 1.5 hours every day seems a lot for an average person but then not really if you think about our activity levels. Still, it is a big chunk of time for most, I hope it doesn't seem too daunting for people. I have been trying to do a stationary cycle ride every day this year and it's been going great, it's much more enjoyable after you get over that initial hump where you feel like you will die every time lol.