What are the most effective ways to incorporate virtual platforms into a cross-training regimen for cyclists, and how do these platforms compare to traditional methods in terms of efficiency and results? Are there any specific virtual tools or software that can help cyclists tailor their cross-training to address specific weaknesses or improve overall performance? Can virtual platforms provide the same level of intensity and engagement as in-person training sessions, and if so, what features or elements make them effective in this regard? How do virtual platforms handle the issue of data tracking and analysis, and are there any notable differences in the types of data that can be collected and used to inform training decisions?