What are the best ways you can achieve type 2 fun?

Type 2 fun is typically described as an activity that is not enjoyable in the moment but highly rewarding once complete. 
Some examples include Marathon running, alpining or mountaineering. Unrelated to physical activities, this can also relate to new challenges that provide a strong feeling of accomplishment once completed. 
For someone looking at taking on a type 2 fun experience, it’s important to first consider how your reward system works. Start with something challenging but achievable. An activity that you can continuously build on is also a great candidate.