Originally Posted by
AdelaaR
If you can do 74 flat kilometers at an average speed of 29,7 km/h with a HR under 130 ... wow man ... you'll go far!

63yo, resting HR 38 if I concentrate 32, Ironman 70.3 Florida this past May...after 1.2 mile swim had an average HR of 150bpm for 56 mile at 20.45mph average with no drafting allowed then a 13.1 mile run following.