Don’t get stuck in a rut!  Do an Ironman Triathlon at your own pace.  You can take up to 45 days to complete the distances:

Run – 26.2 miles (indoor/outdoor/elliptical)
Bike – 112 miles (outdoor/ indoor bikes)
Swim or Row – Swim 2.4 miles (176 lengths of Large Y Pool, any stroke/water jog) or 25,000 meters rowing