Well I would like to start the HIIT training, but I have some questions. I am currently using the elliptical glide machine for about 55 minutes 3-4 times a week. I do about 25 minutes prior to lifting and 30 minutes after lifting. If I do HIIT for 4 minutes with intervals of 30/30 before and another 4 minutes after lifting, will this benefit my body or will it be over kill for my body?