It's quite common to think that adrenaline is usually released when we're doing a rather dangerous activity or extreme sport (which are often the riskiest). The fact is that we don't need to skydive or climb straight up a sheer mountain face to get a kick.
Adrenaline is released in response to a stressful, exciting, dangerous, or threatening situation. For many people, it may be a very threatening and nerve-racking activity to walk up to a complete stranger on the street and try to start a conversation out of thin air. Indeed, there are plenty of activities that we can do to get an adrenaline rush, many of which are as safe as going for a walk.
To get some ideas of how to get your next fix, click through this gallery.