What does base in zone 2 mean? Is that all you are allowed to do, or can you also do some harder sessions? Could you do mostly level 2, but do a race a week on zwift for instance?
Also does activity off the bike contribute anything? I do 3 miles a day walking dogs, twice that on holidays and weekends, so generally a minimum of 25 miles a week. Would that add anything to my base?
Sorry for all the questions!
Zone 2 when talking about HR is a pace you can sustain for many hours. It's not a dawdle , just slightly elevated breathing. To workout your heart rate zones is important. There are quite a few calculators, I used the training peaks calc which uses lactate threshold HR https://www.trainingpeaks.com/blog/joe-friel-s-quick-guide-to-setting-zones/
80% of workouts would be done in Zone 2. Maybe once a week a race or VO2 Max workout to keep peak topped up. To build a base you have to go steady for a number of weeks, up to 12-14weeks depending on how fit you're currently. Possible as little as 6 weeks if you are already in good form.
Use the walks as recovery, if you feel fatigue creeping up
The experts say
, ' think of a pyramid wider the base higher the peak'.
I personally found once I could cycle non stop on a turbo for 3.5hours, high cadence with a heart rate that tracked level right to the end of the session, I was probably ready for next phase, timing wise a cycle holiday was perfect timing.
Zone 2 for me didn't lead to fatigue, so could do it day after day and be fresh each day. I would take one day off a week and a very easy week every 4 weeks.
I also quickly trained my body just to use water for the whole of these long zone 2 sessions. This makes the body more efficient at using body fat as fuel and not eating fast carbohydrates to fuel. I found it particularly useful in Tenerife where I could ride for several hours on water and just fuel at the organised breaks.