Key #1: get organised, make a plan, and stick to your schedule
Planning out your training schedule is extremely important. Don't forget to add your weight training workouts, your cardio sessions, or your running or cycling outings, to your weekly planner. Don't cancel them on the excuse of drinks with co-workers or a meeting that dragged on for ages. Stay focused on your goals, and keep moving forward. And if you work out during the lunch break, don't forget to take your sport bag and water bottle as you head to work in the morning. Also make sure to prepare or plan balanced snacks that give you the energy you need for your workout.