Does the effect last, or will everything come back the moment I stop coming?

The effect works on two levels. Right after a session it's a one-off relief and relaxation, like after a good massage. But with regular practice the body learns to move more evenly, and that gets locked in: the habit of 'living straight, walking straight' appears. The longer and more consistently you practice, the more lasting the result. Since the cause of many aches is our everyday lifestyle (sitting, laptop, scooter), regular hanging works best as a ritual rather than a one-time event.