I agree with all above. I have had many heat injuries and Red urine is obviously blood. If you had said brown, microbrew ale, coffee/cola color then you could be looking at probably kidney issues, but RED is blood.

Blood in urine is not a usual symptom of dehydration though you mention some other issues that certainly fit the type. Maybe, big maybe, the twisting you did while practicing your golf swing did something internal in that area. Vigorous sex or a trauma to the groin could also cause blood in your urine.