The better you get at training at high intensity levels, the more comfortable you will feel with pushing your body to its limits. (anymanfitness.com)
In conjunction with the dietary shift specific training, both in low and high intensity is programmed into the training blocks to push the fat burning envelope into higher intensity levels. (vespapower.com)
Now, I understand, most people are not athletes and many athletes do not sustain such high intensity levels I just described during their training or actual competition. (perfecthealthdiet.com)