Is it safe to do sports right after chemotherapy ends?

Nobody but your body can tell you if you're up to more strenuous activities. I was completely fatigued and could barely walk from one room to the next.

I got plenty of bumps and bruises while on chemo and it didn't disrupt mine.

Your risk of opportunistic infections is greatly increased during and after chemo so it would be wise to make plain to your doctor what it is that you intend to do so the both of you can go over your labs and see if your platelets other cell counts are at a safe enough level to take those risks.

Quality of life is one of your doctor's main goals so don't think there will be an automatic bias against exercise and sports. Just get the information you need to make the right decisions.

So glad you're enjoying some relief from the Crohn's and I hope you'll do what you need to do to get that lymphoma killed.

Exercise improves the outcome in most cancer treatments - sometimes significantly. I don't know if there is something unusual about Burkitt's that would make it different from other Lymphomas with regard to exercise. Anything you are capable of doing without wiping yourself out for the next few days is likely to be beneficial for cancer treatment and also for Chron's.

Exercise is always good unless you are at risk of injury

If you are up to, start slow and see how you do. And ask your doctor.