How do you solve lazyness?

I have two sons. The oldest (13) has no problems to get out of bed in the morning and practically jumps out of bed while my youngest (10) takes more then a half hour to get awake. My oldest is like my wife fairly active and my youngest is more like me, fairly lazy ;-). I too can’t get out of my bed and though I’m quite happy in my live, I have difficulties to get me started on something. I’m 40 now and still haven’t found a ‘solution’ on my lazyness. Because I want my youngest son to be more active (he is even lazier then I), I’m asking you to help me.