Whilst cardio based exercise, so any activity that increases your heart rate for a sustained period of time, is important for the health of your heart and blood vessels, weight training is important for other reasons: for muscle tone, strength and bone health. The latter can be improved via weight training as sometimes joint problems are due to weak muscles not sufficiently supporting the joint, for example knee pain/discomfort could be caused by weak glutes. If you can incorporate an hour of weight training a week into your usual exercise your body will thank you for it and the accompanying increase in strength and muscle tone is never a bad thing.
3. It keeps you living longer
Possibly the least sexy point, left until last, but no argument about it being the most important! Lifting weights increases the chances of staying alive longer than somebody who doesn't. Once you reach your 50's and beyond, strength training is critical to preserving the ability to perform the most ordinary daily living activities, and to maintain an active and independent lifestyle. Lifting weights helps illnesses such as osteoporosis and brittle bone disease, not only this but it has even been shown directly in one study that the more muscle mass you carry on your body the longer you live!
If you feel ready to get started read my next article on Getting to Grips with Weight Training.
Personal trainer and physique coach