I climb hills faster and don"t have to hack out a lung at the of every hill any more. But...there always seems to be a ligiment or muscle that is on the verge of failure. And small strains take a LOT longer to heal than they used to. One of the mags had an article recently about ageing and exercise, they said that people can improve performance much later in life than previously thought. But increases in mileage and speed have to come slower. Gotta train smarter,coax the body along, can't beat it into shape anymore.