Celebrate small steps!
Your fitness is cumulative. Not one workout will make or break your fitness. Fitness sticks with small changes. Set a mini weekly goal to maintain your focus. For example: Set a goal to complete 4 cardio workouts lasting of 30 minutes each. Set a goal to complete 3 strength workouts. Set a goal to do your stretching routine daily after work. Short term and long term goals are great, but mini weekly goals will keep your interest and motivation high.