My 2 cents.
I think it would depend on the weight used. If you're doing it at the level of Alwyn's program, then it's more of weight lifting stimulus. If you did it with lighter weights (and hence, more reps and/or sets), then it would have an effect more like HIIT or intervals.
There is probably no "fine line" here, but more of an overlapping of each effect that shifts on way or the other, depending on weight, reps, sets, intensity, etc.
I do complexes instead of intervals on my off days. I think it has a positive effect on recovery, as well, as it works more muscles that sitting on a bike.
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Lost Dog's Blog & Workout Log
Superman never made any money
saving the world from Solomon Grundy
and sometimes I despair the world will never see
another man like him
-Crash Test Dummies. "Superman's Song"
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