When we are looking true results - mental and physical -, we have to be willing to get a little (or a lot) uncomfortable. We have to be willing to push harder than we think we can push...because we are capable of doing so much more...we're so much stronger than we think we are!
One of the keys to getting out of that comfort zone is to shorten the duration of the intense workouts but UP the INTENSITY. Push HARDER but for short periods of time. Workouts such as Insanity Max30, Hammer and Chisel, and 21 Day Fix Extreme work on that principle. Shorter time, greater intensity.
Get 6 Tips on how to get more out of your workouts by upping your intensity, courtesy of Livestrong.org.