Why not follow the program as written and only do intervals on the days prescribed (e.g. stage 2 workout B) instead of adding them in as extras and see how you feel?
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my training log
"Have fun and be determined to finish"-- Jack "UpNorth", 9.
"You see yourself every day. Nothing changes. Change comes in an explosion of awareness. You wake up one day and it dawns on you that it's not a sleep line but a wrinkle." - Deserve (aka Gabe)
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