The Hashira Have Learned About the mark From Tanjiro Kamado, Due to Two of the Hashira's Gaining A Mark they Have Decided to Learn how to get one, The Demons Have been Rarley showing up, The Hashira's Knew Something was Wrong. As Nezuko Kamado, A Demon has Learned to Concure the Sun.

'*Where Would you start?*' - 
Fitness and Stamina- Former Sound Hashira ~ Tengen Uzai
~
Rapid Movement Training- Mist Hashira ~ Muichiro Tokito 
~
Flexibility Training (Ouch)- Love Hashira ~ Mitsuri Kanroji 
~
Sword Skill Revision Training- Serpent Hashira ~ Obanai Iguro 
~
Infinite Striking Training (Good Luck)- Wind Hashira ~Sanemi Shinazugawa 
~
And Finally 
Muscle Amplification Training- Stone Hashira ~ Gyomei Himejiman