Cross Training

• Biking: They say you never forget how to ride a bike, and that's probably true. One of the great things about biking is that it's not a weight-bearing activity, so it's easier on your joints. A simple bike ride is a great activity to do with family or friends, too. Safety first, though: don't forget to wear a bike helmet!
• Swimming: This can be an all-body workout, because swimming gets you to use lots of different muscle groups at the same time. Like biking, it's also not weight-bearing, and in fact getting in the pool can be a good way to ease back into activity after an injury.
• Strength training: The idea of "lifting weights" can conjure up images of body builders. But the reality is that you don't have to be an Olympic athlete to benefit from strength training. And you don't have to invest in a fancy gym, either. You can use a simple pair of dumbbells, a resistance band, or even your own body weight. Simple exercises include squats, lunges, bicep curls, and situps.
  
• Hiking: To some, this may seem awfully similar to walking. But the truth is that the differences can be significant. The balance required by hiking on sometimes uneven terrain helps build your core muscles. And climbing up and down hills will use muscles you may have forgotten even existed.