The Past, Present and Future

When you sit in one place on Earth, everything you see on Earth has happened in the past. The farther away the sighted object, the more in the past is your vision of it. When you move across the Earth you begin to live in the present. The things you see ahead of you are much less in the past when skiing or biking toward them. Those things may become part of your future. You have foresight when in motion. Objects at rest tend to stay at rest. The same could be said for humans. If I were to bet that you are vitamin D deficient, I could be a rich man. Get outside. It won't get done if you don't do it.
And on the nature of Fun:
I have come to believe that there can be an equation for Fun. Though not yet fully completed, the chief descriptor for Fun is the Slope of the Learning Curve. It seems to me to be reasonable that if you are getting high returns on a small investment in a new endeavor, you will be smiling. In other words, if you take up snowboarding for the first time and find it simple to learn you will be having fun. Lots of great riding without much effort, how could that miss? If you take up tennis and after a few lessons you can play a game without hitting the ball out of the court you will be having fun.
The important thing is moving forward, participating in life because it's the journey, not the goal that means the most. For however great what comes after it is not this life, which makes this life special, not the prize later that lasts forever. This is the heavenly time. Don't waste it. Why do think they call it 'the present'? Let your knows be your guide.