Avoid weights and pressure which guves you strain and pain. specially squats and lunges.

Avoid lifting weights which can make your condition worse. avoid doing squats and lunges which adds strain and avoid excessive running , deep breathing can help you feel relaxed regular walks can, to some extent, cut down the chance of developing them Legs up the wall pose exercise boosts blood circulation, it is great for alleviating the pain and discomfort related to varicocele. You must begin by sitting right next to a wall, lie down in a comfortable position and slowly lift your legs on the wall. Maintain an angle of 90-120 degrees between your body and leg Hold this position for at least 5 minutes and repeat it every day

Avoid weight lifting

Yes you can do gym . No problem but concentrate on the upper arm chest.

Avoid  weight lifting,lunges and squats ,cross training techniques which gives pressure and strain. Only mobilization exercises like brisk walking, stretching can be done to ease the varicocele.