Running. It can be causal or it can be extreme. I have friends who participate in 3ks, 5ks, 10ks, half-marathons, full marathons, Tough Mudders and I'm pretty sure one of my friends is planning to do a Zombie Run where there are people dressed up as zombies and they try to eat you by tearing off flags that you have around your waste. All of my running friends have tried to get me to go on these runs. For me though, running is very casual, like "only a mile on Wednesday mornings because it's good for me" type of casual. That's about it. 

Read more about why I'm talking about running and how it is linked to the race that really counts. 

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