France's dominance in the Six Nations may be linked to British and Irish Lions tours. Since rugby union went professional in 1995, Les Bleus have won 10 Six Nations titles, with six coming in years following Lions tours. Former Lions captain Sam Warburton believes the physical and emotional toll of touring helps France capitalize on home nations' fatigue.

Warburton describes the Lions experience as emotionally draining, requiring players to maintain peak intensity for 18 months straight. England's Tommy Freeman and Ireland's Tadhg Furlong reported similar struggles returning from last summer's tour of Australia. The mental exhaustion is compounded by the fact that home nations players peak for Lions tours, leaving them vulnerable in the Six Nations.

France's advantage extends beyond Lions fatigue. Their domestic season runs longer than England's or Ireland's, and they typically rest stars for summer tours while Lions are away. This year, France defeated Ireland and England in Paris, crucial victories in their championship run. The Six Nations' even-year schedule also favors France, giving them three home games including matchups against traditional rivals.