Hopefully by now you have added some strength training to your workout plan since it has so many benefits (making you stronger, firing up your metabolism, and the new exercise guidelines recommend 2 sessions a week). The experts, however, all seem to have different ideas on how to go about it.
I found the age based approach by Dr. Kenneth Cooper, the doctor that coined the word "aerobics" back in the '60s, interesting. He now advises his patients to perform muscular conditioning in a graduated amount based on age. Since the human body slows down in building muscle mass in the mid 30s, the older you get the more time you should allocate for strength training in your workout. He found that as he aged he was able to maintain his aerobic endurance but lacked strength.
Here is what Cooper suggests:
|Age in decade||Cardio Training||Strength Training|
If you are in your 20s, you should still do a mixture of cardio and muscular conditioning; the key is to listen to your body. If you are experiencing injuries (like sore knees from running mile upon mile), you definitely need to add strength training to your regimen.