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@howardrf Cheers.

@jim35215 I think you are making my points for me! A bike will also let you use a 100% oxygen capacity, a beginner with a lighter KB (as a % of bodyweight might not achieve that). A bike is suitable for a active rest interval. The bike is safer for beginners AND a fatigued experienced KB...

@juancarlos Fair point - I had the original Tabata protocol in mind when saying the rests were long - Tabata is 20seconds on 10 off. The study is still poor and I still wouldn't recommend KB for HIIT when there are better tools out there.

@howardrf Well that study looks like crap. Only had 8 subjects and (it's slightly unclear) but only seemed to cover 6 sessions- 2 introductory, 2 with KB and 2 on a bike. The KB and bike HIIT sessions don't seem comparable. The KB sessions were 3 circuits of 4 (unspecified) exercises...

@firewatchduty This.

@juancarlos Good point - not everyone does have a bike. Run hill repeats or do shuttle runs then no equipment at all needed (beyond a stop-watch/timer). Injury risk is higher than a bike but lower than using a KB in highly fatigued state. Is 'why train without a coach' a serious question...

@howardrf If you want to do HIIT, why not do it on a bike? It's the right tool for the job; far lower injury risk, far more efficient and effective. I mean you could build strength by lifting a bicycle over your head but that wouldn't be as effective as swinging a kettlebell... Choose the...