Can someone please explain in simplified terms what EN1, EN2 and EN3 actually mean?
Experienced thoughts on how often each system should be trained?
For someone who swims mid-long distance freestyle, which energy systems take dominance, if any?
(clearly I'm lost!)
Thanks
:)
Parents
Former Member
Another way to define this, using heart rate:
En1: Max HR - 30-60 bpm
En2: Max HR - 10-20 bpm
En3: Max HR (which you can calculate by 220-age)
