Working out teaches you discipline and patience like few other things do.
Working is not painful.
Pain is showing up for the workout. Getting off the couch. Having proteins. Having meals on time. Keeping track of your body measurements.
These are the things that need discipline. These are the things that grow your discipline and patience. The reward is understanding the fact that all worthwhile things require discipline and patience.
Not everything comes at the speed of a tap on a smartphone!