Take note of the fact that the following ride in week 4 is a higher TSS and longer duration than the one from the prior week.
- My guess is that the Wk4 Wed ride is deliberately set lower in anticipation for the more demanding Wk4 Thur ride.
- Also note that Pettit -1 is 60 mins vs Carter that is 45 mins. Again, stepped progression on full display here.
Again, there is a purpose to each choice there. You can and should modify at times, but be cautious about adding more stress when it may lead to counter-productive effects in later workouts.