This will be the second rest day at the start of the Boston ’17 training. My HRV score reflected the rest, jumping to 57 from 52. It’s amazing how a single rest day can have such a positive impact. I still have a little stiffness in the lower back and high quads (in the rectus femoris area), but am definitely feeling more rested. This few days should start me off on a great track for the rest of the program.