Since we are stuck at home, doing exercise is limited. Which is not healthy either. According to the news, in this period we have to strengthen our immune system, so beside taking Vitamins, we should also move enough.
You can start doing simple exercises at home like sit-up, push up, yoga. You can find many of them on Youtube or another sites as well.
In addition, if you have garden, you can always do gardening. With that you also create a beautiful backyard to enjoy, especially since sunny weather is coming.
If not, then deep-cleaning your house will also keep you fit, since you have to move around a lot. You can finish your day with easy stretching, so your muscle can relax. At the same time your house is well disinfected.