Go to any high school track in the late afternoon and you'll see both men and women in their forties doing laps. They've realized that it's important to keep that heart pounding, and some of the aggressive ones will leave the track and take off cross country for 16 to 20 miles a day. Soon they look fantastic, but they're not going to be able to escape what the old preacher says at the beginning of Ecclesiastes, "Emptiness. Emptiness. It's all emptiness." Or as the Hebrew text literally says, "A breath, breaths--everything is a breath!" meaning that our physical life evaporates like our own hot breath in the cold on a winter day. The point is that if we only live our lives under the sun, when it's all done, we won't have anything left in our hand. But the Apostle Paul in 1 Corinthians 15 says that if we live for life in the Son, he will give us the gift of resurrection. Even if this life gives us 70 0r 80 or 90 years it's not enough. Jesus gives us eternity.