Plateaus are something to push against. They help you climb up to the next level. It is a resting spot to help your body adjust. They do not last forever.
For the past few days I have been battling a major sinus infection. It amazes me what a little bit of feeling under the weather can do. Prior to today I was feeling triumphant. I was in 'the zone' and felt like I was winning.
My husband did morning PT for 20 years in the Marine Corp. Now he hates morning workouts. He likes to go to the gym after work. He does a few minutes of cardio and then hits the weights hard. It relieves the stress of his day.