This is a thought-provoking image from Baron Biosys’s blog post from today (they make xert). I like pretty images.
For those of us learning the Friel Bible off by heart we might look at the FTP-based zones and nod sagely whilst musing to those friends who will listen, “Ah yes, the lesser-spotted sweetspot, I know it well.”

‘Obviously’ all training for every ability-level of athlete for any distance will naturally involve 2×20′ sweetspot sessions @85% of FTP. #lol.
So, should we really use the 7 zones and sweetspots or is there a better way?
Baron Biosys conclude their musings with the inevitable (and correct) “It depends” or in their words:
Sweetspot training, when used by some athletes and for the right purposes, provides an excellent way to train. However, for many athletes, SST amounts to the black hole of training, where it’s too hard/short to provide endurance training benefits. Many athletes fall in-between, where depending on the specific intensity the SST falls into and its relationship to LTP and their training goals, will determine whether it is a wise training choice or not.
Duathletes aside, many of us will be just getting into our training plans for the year ahead. Before we get too set in our ways the article might be worth a quick read as a sanity-check to see if we are embarking on our triathlon travels with the right training roadmap in our pockets.
Full article: Link to: baronbiosys.com