I feel it is important to participate in such activities because it motivates you to challenge yourself, and be educated while still being entertained. One time i have experienced this was when I went on a hiking trip! we had to climb up a trail to read the top of a rather large hill... it was difficult and physically challenging but in the end I made it, and it was a fun experience, seeing the birds fly above me, hearing the sounds of nature, all while working towards my goal (to reach to top) So yes i find these types of challenges fun and useful.