• Training below that level is going to stimulate far less training response, and certainly isnt going to help you adapt to holding more

    But volume is still the biggest factor that affects improvement IMO. Intervals have their place in a time limited training program, but you'll never improve long term without increasing volume over time, and you can't just keep doing more intervals. Need longer sessions at lower intensity to increase training load.

  • Need longer sessions at lower intensity to increase training load.

    Yup I've had to restart Z2/3 miles because of detraining in my speed phase. Tour of Sufferlandria gave less TSS than my 15hrs Z2 and 3hours intervals.

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