I have accomplished low impact and just started HIIT. I would have to go with the HIIT. I feel that the HIIT has caused a fast transformation that I did not see with the LIT. I also attribute my slow leg growth to all of the LI T. I ran over 850 miles one year and my leg growth was very slow.
I obviously need to give HIIT the test of time before I can fully compare, but so far HIIT is my choice.




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