Please excuse the briefness of this post; I'll expand it further for another post.
A man called Lubo has come into our lives over the last 8 months and he knows a thing or two about fitness training; in fact he's well qualified. Last night we were sitting outside with coffee on our patio and we were talking about exercise generally. I said how I liked to do a sprint finish so I could really enjoy all those endorphins and then to burst in through the front door, all breathless and dripping with sweat.
He advises against this, no matter what good fun it is. It's important to cool-down for 5-10 minutes and for me, at my age, to bring my heart rate down to around 100-110bpm.
"Will I be storing up future problems if I don't do that Lubo?"
"No, you might not have a future".
So, there's more to cooling down than clearing out that lactic acid from muscles. It's a heart thing as well. We'll come back to that another time.