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seen Nov 29 '12 at 5:28

Nov
26
comment What work/rest timings should I use for my HIIT workouts?
From my experience with HIIT, I didn't use a machine but through track sprints and from my understanding of HIIT, the purpose is to allow you body to recover faster from these interval bursts and allowing the heart to become more efficient as it rises. I don't really understand your second question, but I would sprint to your fullest for 20 seconds, then walk it out even if this doesn't seem 'challenging' at first, but it just allowing the body to adapt.
Nov
26
comment What work/rest timings should I use for my HIIT workouts?
ncbi.nlm.nih.gov/pubmed/17313282 : mentions about the optimal ratio for HIIT.