Hi. It is important to know the grade of varicocele , which side ( left is more common and has more effect on increase in abdominal pressure as the vein connecting it is draining high in the abdomen into the main vein of kidney. What are your symptoms? Are you married / if yes have you completed the family ( children) ? All weight training will put a pressure on your abdomen. This will always increase the intra-abdominal pressure. This in turn increases the backflow in the vein draining varicocele veins as they do not have non-return valves , are too long and draining into Kidney veins which are too high and work against the gravity.