Physical activity improves physical wellness and boosts mental wellness. Regular physical activity can relieve tension, anxiety, depression and anger. You may not only notice a "feel good sensation" immediately following your physical activity, but most people also note an improvement in general well-being over time during the weeks and months as physical activity becomes a part of their routine. Becoming more active can help lower your blood pressure and also boost your levels of good cholesterol.
If you keep living in the future, if you keep living in the past, you will miss this nowness, now and here. You cannot change the past, but you can use this nowness, to make the ingredients for what you want to make of the future.