Really? Im 6 years older than you and can get my heart rate up into the high 180s low 190s if I really really push. For me a run with an average of 152 is one where I'm not really trying that hard. Guess we are all different
I wouldn't worry about your stride length particularly I would concentrate on your intervals and tempo runs. Have you tried fartlek sessions? They are quite good at helping to build speed.
I wouldn't worry about your stride length particularly I would concentrate on your intervals and tempo runs. Have you tried fartlek sessions? They are quite good at helping to build speed.