When Paul explains running the race with endurance, he very accurately explains how long and difficult it is. It's a decision that takes extreme sacrifice. So often we get excited to do these awesome things, only to fall apart a week later when we realize the work it takes to get there. Life takes sacrifice. God requires us to sacrifice a lot to follow Him. Yes, we want to follow Jesus because He is incredible, but we quickly abandon the cause of Christ when we have to start sacrificing. But if we push on, staying strong, running with endurance, the reward is incredible.
There were many weeks where my workouts struggled because I couldn't stay motivated, but I continued doing the workouts, pushing past those rough weeks, and in the end, it was so worth it. I had to sacrifice time with friends, money, and pretty much my life for 6 months. At times I wondered if it was worth it, if all this sacrifice would pay off, but crossing that finish line, it was worth it.
The biggest thing was keeping my eyes focused on the goal. If I was not focused on the goal, I would not have made it to the end. The race of life takes focus and constant sight on the goal. Only when our eyes are set on the finish, can we stay strong and committed to the cause of Christ.