Work in focused intense sessions of 30 to 90 minutes without checking email and handle email in scheduled blocks of time. (slaw.ca)
If one intense session in the gym normally requires you to put in a few days of rest, you're losing valuable time that could be spent continuing to build and gain. (roids.co)
He was aware that I was very busy and had a high stress level so he recommended that I only workout for two very intense sessions per week. (personalfitnessadvantage.com)