I like running and climbing. Maybe these advices can help you
1. No matter what you do, it should be fun doing it, otherwise you ll stop it soon after you have started. Disciplin is good for a short period, fun keeps you doing it for a long time.
2. Running: Frequency and time are important, not distance or speed. Jog for 15-60 Minutes every 2nd day instead of 10km (or miles) fullspeed once a week. With time you can go to longer runs. After some months (when your knees and ligaments got used to running) you can integrate speed intervals into your runs . Speed units are for example 100m at full speed, or half a mile as fast as you can. You can vary this. After one speed unit you should jog very slow and recover before you go on with the next one.
3. Do you have the possibilty to climb? In a hall or on a rock? With climbing you get muscle strenght, strenght endurance and body tension without getting muscle weight. In addition it has some similarities to drumming. You have to coordinated all four limbs at the same time. And its creative, different foot and hand holds require different styles and techniques. But most important its fun (or addictive
). For me spending a day on the rocks int the sun with a couple of friends is all that life is worth living.