When Should I Cross-Train?
The amount of cross-training you do really depends on how you're feeling -- both mentally and physically. In general, if you're a recreational runner, try to supplement your 3-4 days of running with 2-3 days of cross-training. If you're a competitive runner and run 4-6 days a week, you can substitute a low-intensity cross-training workout for an easy run or a rest day on 1-2 days week. Cross-training can also be great for runners who are traveling and may not be able to run outside or on a treadmill, but have access to other sports.
If you're dealing with an injury and sidelined from running, you may need to cross-train more frequently. Talk to your doctor or physical therapist to get advice on how much you should cross-train and what activities are best for your specific injury.
Some runners, both beginners and experienced runners, may hit periods in their training when they are feeling bored or uninspired to run. Cross-training can be a great way to work through those unmotivated phases. Taking a couple days off from running each week to do another activity can help get you excited to return to running.

