questions on HIIT and normal jogging

Firstly, how am I to know whether I am jogging too much over a week? I currently jog for 30 minutes every other morning before breakfast, and I think that's about 3 miles. I feel absolutley fine after the jog and throughout the day, and I'm 16 years old. But I've heard some people say that certain amounts are too much, so is this okay?

After reading about HIIT and interval training I've decided to give it a try instead of jogging, but I was wondering how much variation I should add into the workout. Is variation simply there to stop things becoming boring and tedious, or are there any fitness related reasons for mixing it up? Should it be mixed alternatley (eg. bike, jog, bike, jog), or periodically (eg. 1 month bike, 1 month jog)?

Is HIIT still a good idea for the mornings before breakfast? Common sense tells me that there's more risk of making yourself ill or black out with no food inside you, especially when the intensity is increased.

Judging by what people have said regarding HIIT, am I right in thinking that statements such as "high intensity cardio builds muscle, low intensity burns fat", "low intensity cardio for long periods is better than high intensity for short periods".....are false?
 
thats a good amount to be jogging.

HIIT is awsome, i just do it on the treadmill, or the bike if im feeling a little tired

HIIT is good in the morning but depends on your energy levels, because HIIT uses so much engery it may leave you tired for the rest of the day. i do my HIIT at night around 8ish then i usually go to sleep after that(its more fun going to bed early and getting up at like 4 or 5 and making your self a nice big breakfast.)

good info on HIIT:
 
Interval training can be extremely effective if you apply it correctly.It is easy to burn out from training too intensely though.For variety, you may want to do something like this using track running as an example:

Monday:
400-meter intervals x 6 with 90 second rest intervals.

Wednesday:
800-meter intervals x 3 with 90 second rest intervals.

Friday:
400-meter intervals x 4 with 60 second rest intervals.

You can apply this to the bike or swimming or whatever.Just make it challenging and allow for enough recovery and you should be fine.
 
that sounds good, but what I'm asking is as long as I don't get bored, is there any advantage to having variety?

I would rather base the bouts on time rather than distance. eg. 30 second sprint - 1 minute jog, etc.

Would it be a nice idea to do something like this every other day, alternating between bike and run?
 
I alternate HIIT work-outs:
30 sprint/60 recover
OR
20 sprint/40 recover

You don't want to be doing too much HIIT - 3 times/week is sufficient. And you don't need to be doing any other cardio if you're doing that much HIIT.

You can do HIIT on the bike, too. Or elliptical, stepper, etc.
 
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