I've been indoors (midwest weather) and twice a week i do intervals that include 3 X 3 minutes at all out after 1/2 hour of zone 2. My usual max HR is 185 (I am 45, 185 lbs)
I can't seem to get my max HR up past 178 or so. Do I
>keep doing them till the season officially begins?
>not worry about it, training is training. The numbers will take care of themselves
>max HR is down on the long list of numbers I should be worried about
>explore options now to fix it.