Please explain what exercise can i do with mono?

Mononucleosis: After ebv one may get spleen enlargement and exercise can cause trauma or puts pressure on abdomen which can cause splenic rupture. It takes few weeks for spleen to go back to normal.

Gentle activity: such as walking until symptoms are gone!

That depends on: Severity of mononucleosis. Avoid contact sports if your spleen is enlarged. Please ask your physician if you are healthy enough to engage in sports at this time.