So I have just joined. I am a tall 73 year old male and have starting brisk walking to benefit my health. My second attempt at an exactly 8km walk took 76 minutes, finishing a bit puffed with weak legs but feeling good with a heart rate of 143 which reduces to 114 after 10 minutes. That's as fast as I can go at the moment otherwise my legs get a bit wobbly. How does that stack up and what could I realistically aim for? I am basically healthy albeit a bit unfit and a bit overweight - (10 Kg). I do have medically controlled high blood pressure and cholesterol but they are not a restricting factor. Thank you for any indicators you may offer.