Many of the activities were just a product of their times (such as fear of nuclear warfare creating the popularity of Fallout Shelters and the oil embargo crisis creating a need for Mopeds). Others were simply the cool and stylish lifestyle trends of the day (such as the Waterbed and Hot Tubs
Some were just attempts at entertainment as many enjoyed the laid back routine of kicking around a Hacky Sack, while others were more adventurous throwing around a Boomerang. While some chose to play a standard game like Trivial Pursuit, others decided to express themselves by riding Unicycles.
For whatever reason people pursued them, activity fads kept people entertained and comfortable and added an indelible chapter in the halls of the Bad Fads Museum.