Girona's tactical flexibility is one of the most impressive aspects of their footballing style, and it is something that has helped them to achieve great success in recent years. One of the key factors behind Girona's ability to adapt and change their tactics on the fly is their willingness to experiment with different formations.

One of the most famous formations that Girona have used is the 5-defender formation, which is often referred to as the "Girona system." This formation consists of five defenders, with two deep-lying midfielders and a lone striker in attack. The 5-defender system allows the team to play a more direct and physical game, with the defenders providing support to the strikers in the final third.

The use of the 5-defender system has been a major factor in Girona's success over the past few seasons. In fact, they have won La Liga twice and reached the semi-finals of the UEFA Champions League once during this time. The system has also allowed Girona to create a strong defensive structure, with the five defenders working together to prevent the opposition from creating scoring opportunities.

However, it's not just the 5-defender system that makes Girona so flexible. They are also known for their ability to adapt to different opponents and match situations. For example, when facing stronger teams, they will switch to a 4-3-3 or even a 4-2-3-1 system to create more space and control the tempo of the game. Conversely, when playing against weaker opponents, they may revert to a more traditional 4-4-2 or 4-5-1 formation.

In conclusion, Girona's tactical flexibility is one of the main reasons why they have been able to achieve such great success in recent years. Their willingness to experiment with different formations and adapt to different match situations has allowed them to create a strong defensive structure while still being able to create chances in attack. With their continued development and experimentation, it's likely that we'll see more exciting and innovative football from Girona in the future.