Happiness Is A Chemical Formula

It is obvious that happiness is dependent on an utter myriad of factors which differ for each individual which, perhaps, makes it one of the most intriguing and enduringly debated subjects for mankind.  Of course elements of happiness are affected by our emotions and events it is, however, also a chemical thing - or so I convinced myself this morning.
Serotonin is known to influence one's mental state, as is the release of endorphins and also a hefty dose of Vitamin D.  In order to concoct this happy cocktail, I donned my trainers early this morning and went for a long run through my local park, bathed in glorious sunshine and surrounded by budding flowers.  Not the most scientific of formulas but one that seems to work - if you don't believe me, pop on your running shoes and give it a go - and before the bank holiday rain sets in.
Happy Monday.