I was into triathlons some years ago. The longest distance I did was a Half Ironman. At the time it felt like I was training all the time. I loved biking and running but didn't care for the open water swim, so I eventually stopped doing tris.
Nowadays when I'm not biking, I run 3-4 miles every other day and lift weights on my non-running days. I sign up for 1-2 ultra races every year and they keep me motivated to train. I usually sign up for events in scenic places like the Bryce Canyon Ultra I did in May, so I get a race plus a scenic vacation at the same time.