Managing Obstacles in Plans

Let's run a thought experiment. As a regular gym-goer, you make use of 5 weight machine; 3 are for training upper body, and 2 are for training lower body. They are arranged in an alternate pattern, and you typically work your way down the line doing your sets of workout. When you complete your set at the 5th machine, you return to the 1st and start your 2nd round.