I've been performing and teaching improv for 25 years. It won't necessarily increase happiness (for a few people, it just remains a stress), but it seems to be good for a lot of people. The positive effects include teaching people to go into a high stress situation - having to perform spontaneously in front of an audience - and not worry about failing. Failure is part of the fun, and can be enjoyed rather than feared. (That's a big "life lesson"!) Improv teaches people how to be more aware on what is going on around them, which is similar to certain stress-busting "mindfulness" techniques. We're taught from an early age how to think ahead and plan, but we don't get the same practice in thinking on our feet, and when we practice it, and get good at it, it builds confidence in our ability to cope with unexpected situations. Finally, improv is mostly about comedy and laughing. It's not jokes. What makes people laugh is the immediacy and spontaneity of it all. At its minimum, improv can increase happiness by providing a fun break from the stresses of work. At its maximum, it provides a set of skills which apply to every aspect of your life.
Improvisation - or ad-libbing.
Charna Halpern has written: 'Art by committee' -- subject(s): Improvisation (Acting) 'Truth in comedy' -- subject(s): Improvisation (Acting), Stand-up comedy
Peter Campbell Gwinn has written: 'Group improvisation' -- subject(s): Improvisation (Acting)
John Abbott has written: 'The improvisation book' -- subject(s): Improvisation (Acting), Study and teaching
Gerhard Ebert has written: 'Improvisation und Schauspielkunst' -- subject(s): Improvisation (Acting) 'Der Schauspieler' -- subject(s): Acting, History 'Schauspieler werden in Berlin'
Brad Newton has written: 'Improvisation' -- subject(s): Educational games, Activity programs in education, Improvisation (Acting)
Pamela Bowell has written: 'Planning process drama' -- subject(s): Drama in education, Improvisation (Acting) 'Planning process drama' -- subject(s): Improvisation (Acting), Drama in education
Renzo Casali has written: 'Antropologia dell'attore' -- subject(s): Acting, Anthropology, Improvisation (Acting), Method (Acting)
Improvisation
I assume you mean what that is called. The answer is improvisation, also know as improv.
Lynda A. Topper has written: 'Theatre games and activities' -- subject(s): Improvisation (Acting)
There are several improvisation groups that offer acting lessons. You could also look for an acting coach, a talent agency representative would be able to give you a lead or a few numbers.