Was about 25 pounds over weight, and didn't do any exercise. My resting heart rate was 80s to 90s. Been walking, jogging and jumping jacks, for about 2 months now. Is it possible, to have a resting heart rate of 48 bpm, this fast? Seems strange to me when I started working out, my heart easily reached 160bpm. Now it's a struggle to get to 140bpm.