Cristiano Ronaldo is widely recognized as one of the greatest footballers in the world, and his commitment to training and excellence is well-known. 

Players often engage in specialized training sessions to ensure they are in top form for upcoming matches. 

Ronaldo's choice to work with the first XI indicates a desire for optimal preparation and chemistry with the core team members.

This move might also be a strategic decision by the coaching staff to enhance the synergy between Ronaldo and the primary lineup, ensuring a seamless integration of his skills and style of play. 

It could be part of a broader strategy to maximize team performance, particularly in crucial upcoming matches or tournaments.