1. Do something during your work day- Most people sit all day at work and burn very little calories. Take the stairs more often, or take the long way around the office to drop off that report. You should also get up every now and then to avoid getting tight in your low back and hip flexors. Simply standing up and walking around for 2 minutes helps.
2. Lift rapidly-Lower your weights under control, and then move them up as fast as possible! This will allow you to recruit more muscle fibers and therefore burn more calories!
3. Eat protein with every meal- The thermogenic effect of absorbing/digesting protein is higher than any other macronutrient like fat or carbs. This means it takes more energy/calories to process protein.