Proper Posture Increases Caloric Burn
A study out of the University of Sydney found that people who sit up straight rather than reclining or slouching burn 20% more calories whether in a car or at a desk. Mark Halaki, Ph.D., the lead researcher, stated the increase in caloric expenditure was due to the core muscles of the midsection working harder to maintain proper posture.

Burn More Fat with Resistance Training
Weight lifting adds more muscle mass to the body, which is more compact than fat and burns more calories than fat. Adding resistance training to your weekly schedule results in a 73% increase in calorie and fat burning hours after training. Therefore you become leaner and burn more calories even when resting. University of Neveda