Great question! In addition to being a personal trainer, I am a triathlete. You can add anything you want with cycling. Swimming, running, trx, plyometrics, bodyweight training, weight training, etc. It all depends on your goals. Cycling is a low impact activity so I suggest people should look to counterbalance it with a higher impact activity into their training week. People who make their main active pursuit cycling can be at risk for osteopenia due to lower bone density rates. I tend to suggest that cyclists introduce some form of a higher impact activity such as running or plyometrics into their routines. Then you can also couple it with any form of training you like! Do what you enjoy.