Focusing on living a healthy life, which can include a well thought out training plan and diet, can be invaluable parts of a persons journey in recovery. It goes right along with "changing people, places, and things". You can also use your new "spare time" to research some of the supplement sources for a good multi vitamin, protein shakes, and creatine, or just browse the forums on this site to see how other people are challenging themselves to achieve there goals. You have some years to max out your natural potential before you should be thinking about Gear, and it can definitely be an important part of your sobriety.