I used to be a sports guy, played soccer till I was 15. Then, injury... Stopped sports altogether until 3 months ago (I'm 26 now), when I found a website in my language that tailors a body weight training program according to your shape. I've always been skinny so maybe that doesn't apply to you, but in 3 months I can already see big changes in my posture and overall shape. I can see muscles popping out aswell. If you have shit weather like I do, maybe you should give body weight fitness a try. fitloop.co is a nice starting point.