In the FSI talk "Reconditioning Toolbox for Hamstring Strain Injury," several main topics were discussed to provide a comprehensive approach to managing and rehabilitating hamstring strain injuries (HSI). The talk began by addressing the first plan after a player sustains an HSI, which includes initial steps to assess and manage the injury.

The classification of HSI was another key topic, detailing how injuries are categorized based on severity. 

Early stage HSI management and the progression of high-intensity actions following an HSI were also covered, emphasizing a gradual reintroduction of activities to ensure safe and effective recovery. Controlling and monitoring the progression of rehabilitation was discussed, highlighting the importance of regular assessments and feedback to guide the recovery process.

Incorporating sprinting into the rehabilitation program was another crucial topic, with guidelines on how to gradually reintroduce this high-intensity activity. Finally, a checklist before a player returns to competition was presented, ensuring that all necessary criteria are met to safely reintegrate the player into competitive play.

These main topics provide a structured framework for the rehabilitation of athletes with HSI, aiming to reduce the risk of re-injury and ensure a safe return to competitive performance.