The muscles in your pelvis provide support to the bladder and urethra. When these muscles are weakened, there is sagging of the bladder and urethra, which prevents the urethra from closing, thereby causing leakage of the urine from the bladder whenever pressure is exerted by the abdominal wall on the bladder (in case of coughing, sneezing, lifting weights. etc.). This is called Stress Urinary Incontinence. The muscles of the pelvic floor and urinary sphincter may lose their strength due to:Childbirth (in females)Prostate surgery (in males)Chronic coughObesitySmokingStrenuous activities for a long duration, like jumping, running, etc.