People say, live life to the full, live each day as if it is your last, you never know when it could all end. Personally, I would hate to have achieved all my goals, to have met all the people I has ever wanted to meet, and then realise, I'm only fifty!
I do not want to spend my remaining time on earth twiddling my thumbs, wishing I had paced myself a little.
I see no point in building up a massive sweat, only to realise you have twice as much deodorant as you expected!