Hi, my blood pressure on Monday was 120/68 and pulse was 60. My usual workout is to jog 4+ miles, then sprint a lap/walk a lap, alternatively, for another mile. My 67 year old body tolerates the regimen, but should I be pushing myself pushing myself so hard? Running, hiking and hard exercise function as my stress reduction program but I am actually about 20 lbs. lighter and 2 inches shorter than when I served in the USMC in my early 20 s. Is that healthy?