yeah, umm no. They suggest it in the off season to help balance muscle groups in order to stave off injury and prevent boredom. Actual science suggests that in many applications, weight lifting, to take one example, actually makes you slower. Which in the winter tends not to matter to guys because they're building a fitness base.

Again, it depends on what one's goals and baseline fitness are. If you're looking to get faster during the cycling season weight lifting isn't going to do it. Running isn't going to do it. If you're looking for overall physical fitness any number of things will accomplish that.