I fully agree that exercise, or at least getting outdoors for a stroll plays a very important part in our health both physically and psychologically, however short term ( a couple of week or so,) having the activity seriously restricted is not going to be massively detrimental to most folk. ( think of other ailments that we get where we may be "floored" for a period of time and unable to do physical activity)
The effects of COVID 19 by contrast, …...I really don't need to explain do I ??
Perhaps you are unable to see for yourself, but as an outsider looking in on the intended pusuits of yourself and some others, it is clear ( to me at least) that you may well put other people ( not discounting yourselves) at risk.
It's also possible that by going out you may not pose any threat whatsoever, but is it not, at least for the short term until we learn more, more respectful to our fellow human beings to avoid any chances of adding to the propogation of COVID 19