I think it will get more rp into this forum not only training.
I see that no one posts so I give you guys courage by posting my stupid arc here.
Name of the arc: Gekido of the Bear Country
Story of the arc: Many villages have reported that their village is being under attack by wild animals. It isn't just in one village but all over the world. All the shinobi villages (Konoha, Suna, Iwa, Kumo, Ame, Oto, Taki, Kusa, Getsu) will place one of their shinobi to start the investigation. The chosen ones meet and scatter around to find who or what caused animals all over the world to attack villages.
The hero of the arc: Chosen One from each Shinobi Village. Not Kage)
The villain of the arc: Gekido (From Bear country)
Gekido is a scientist from Bear Country. He has made an infection jutsu. When using the jutsu on animal it gets in Rage and in Pain. It will start attacking random living beings or just villages. While biting the other being the infection will spread. It also works on humans but not as effectively as with animals. If someone kills or makes Gekido to release the jutsu all will be okay.
His goal is to first take over the little villages, then gain a lot of money, hire missing ninjas and later take over the smaller shinobi countries like Takigakure or Amegakure.