Just do it. I'll bet you probably have tons of energy, but also more responsibilities and even in your youth you were not that dedicated - you just had moments

Just do it. I'll bet you probably have tons of energy, but also more responsibilities and even in your youth you were not that dedicated - you just had moments of intense interest and did stuff for fun without too much diligence and no other worries. Maybe carve out some 'me time' for whatever. And a bit of cardio really, really helps.