When was the last time you cleaned out the laptop bag? First of all, are you still using a carrying bag or have you switched to the more ergonomic backpack yet? These are not always feasible for the business environment but they are certainly better for your back.
Clear out those files that you haven’t used since the last project finished – and while you are at it, purge the files before putting them away.
Reduce the number of pens, pencils you carry around. How many do you really need? And what about all the computer attachments? If you carry your computer regularly, do you really need all the bits and pieces that you use once a year? Could some of that be stored in a dust free container in your office and be packed for the overseas trip once a year when you need the electrical converter?
Do your weight lifting at the gym – not getting in and out of your car or the bus.