I'm constipated but going to the toilet every 2 days and my stool is actually semi-soft. but after straining i only get out a tiny bit of feaces-3cm?

Poor relaxation..: Many patients have "outlet constipation". The stool is soft but does not pass easily due to poor relaxation of the pelvic floor muscles that help prevent leakage during lifting, coughing, sneezing, etc. These muscles must relax to have good rectal emptying but in many people do not. Pelvic floor training with a good physical therapist is often effective.