[header] How to hold in pee when you can't use the bathroom [title] Visualize closing your urethra. [step] Your urethra is the opening to the outside through which urine exits your body. Imagine squeezing muscles surrounding the urethra while allowing your other muscles to relax. 
These are the same muscle you would squeeze if you were trying to stop a stream of urine. Relax the pelvis and abdomen to avoid placing additional pressure on the bladder.