As per me its a soccer because, 1. Anyone can play soccer 2. Not complicated to play 3. Best Workout 4. You can play soccer anywhere 5. You can play solo
soccer is, by far, the most demanding............non-stop running....always keep an eye on the guy you're defending....one slip on the field and there goes GOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOAL
definitely ironman triathlons. not only does it take like 8hrs for the elite to do, the training that they have to go through to get into the condition to compete is just scary. you pretty much have to say goodbye to any spare time you have.