This is by no means meant to rag on myself, but I have heard people say many times because of my athletic build that I must love working out. Ha! Here's my documented answer....
When it comes to working out I enjoy three things, the longevity of improved health, the energy, and the long-term results from a good pump. That's it! Why? Ask yourself, who actually enjoys stressing their body to the point of pain? Who enjoys being so sore two days after training that it sucks to walk and do other functional activities? Who enjoys their arm getting locked up for 30 seconds while trying to take a shower? I sure don't!