Roger this. Honestly I don’t even use IF as a metric anymore. If I’m planning or looking to substitute out workouts, I will use TSS. TSS tells me whether or not a workout is going to suck. IF just tells me how much.
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Just finished it… my God! How I kept going to the end I will never know. Did the whole thing in level mode to avoid trainer lag and to ensure that I was at or above the targets from the word go. Think this is the toughest HiiT workout I have done.
I often say that the toughest workout I have done is the one I am doing at the time 
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…or the one I’m ABOUT to do.
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For me, those ones ALWAYS look easier until I actually start doing them 
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My HR goes up just thinking about them!!
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