Exercise terms are confusing. Experts say a good routine includes a mix of aerobic, flexibility, and strength training. Here's a cheat sheet for novices:

Aerobic: Activity that continuously uses large muscle groups for sustained periods of time and ups your heart rate. Examples: skiing, swimming, biking, walking the dog, or doing the conga.

Flexibility: Exercises that increase the range of motion in a joint or body part. Examples: stretching, Pilates, yoga.

Functional fitness: Exercises that help in performing daily tasks. Can be a mix of aerobic, flexibility, and strength training. Examples: standing on one leg to improve balance, stretches to help with reach.

Non-weight bearing: Aerobic exercises that don't load the direct weight of your body on the skeleton. Examples: swimming, cycling, rowing.

Strength or resistance training: Exercises using weight to repetitively work both large and small muscles. Examples: lifting free weights like barbells, using weight machines, doing push-ups.

Weight bearing: Aerobic exercises that directly load your body weight on the bones. Examples: running, skipping, basketball.

The CDC provides more information on physical activity at www.cdc.gov/nccdphp/dnpa.