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Aerobics/modified HIIT?

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Question
Che
I am hearing a lot about HIIT or interval training to lose weight. I tried it a few times and I felt like I was going to croak! I am 55, with hypertension (controlled) and two bad knees and a 'so-so' back.
Would a 'modified' HIIT workout be helpful, or does it HAVE to be flat out for 15 seconds like a bear is chasing you? I am doing this: running fast (not jogging) for one minute on my manual incline treadmill, rest ( I putt on my carpet a few times), weights, than run again for five reps.
It leaves me exhausted but feeling OK. Thanks for your thoughts!

Answer
It has been my experience with HITT and weight loss that the high-intensity intervals do not have to equal "bear chasing you" speed or effort to still achieve weight loss results. You can easily modify a HITT program by choosing less high-impact exercises (like running) with bodyweight choices (like squats or hip thrusters, depending on the pain it may cause with the knees and back).  

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Che Krause

Expertise

I can answer questions regarding aerobic/cardiovascular exercise for different age groups/genders as well as provide solid science-based answers regarding strength training. I can answer questions regarding basic nutritional information (following the Canadian Food Guide) and will be able to back it with college-level research. I am unable to provide answers regarding specific diet planning (beyond the advice of the Canadian Food Guide)and I am not experienced in body-building and would be unfit for those questions as well.

Experience

I am currently a personal trainer for an all women's gym which deals with mainly weight-loss and minor rehabilitation exercise programs.

Education/Credentials
I have a two-year college diploma from NAIT in Edmonton as a Certified Personal Trainer.

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