Although they knew each other for a short time, Tsukiho saw that Tsunade worried about her genuinely. And she considered her as one of her own.
She understood that she was afraid that she will also ended up like her younger brother. At that moment she also started to consider Tsunade as her one of family members.
"I'll Tsuna-chan, I'll definitely be careful. Ya know" she had a wide grin on her face. Then she blushed when she realised that she put a verbal tick at the end.
Seeing her embarrassing face, Tsunade chuckled along with Yuna and ruffled her hair.
"Okay now enough distractions back to the topic. Actually strange force technique is pretty straightforward and simple. From your mother you have already learnt the stance so I won't going to explain them to you. If you have any mistakes I will correct them when we practice. This style don't have any lethal moves like Uchiha taijutsu but this also has the same effect because what makes strange force technique lethal is the way of chakra usage."
"That means our every move will be reinforced by chakra. I've already using it but it wasn't like the way you use it yesterday." Tsukiho said questioningly.
"I saw the way you use it and I know your mistake too. So first listen." She sighed to calm herself down.
"If you want to punch then you need to gather chakra first and release the impact. Like you doing it now. Kicking is also the same although I didn't see you doing it. I assumed that your mom didn't told it."
"I never told it but I figured out when I got my first kill" Tsukiho sighed as she remembered that incident.
"Very well then." She guessed her first kill was very troublesome one as she saw a complicated expression. Then Tsunade sighed in relief that she managed to handle it well.
"When it come to blocking. Infused the chakra in to the body part you want to block. Not cover the body part from outside understood?"
"Yes" she nodded.
"This technique gives you both offence and defence. And you need to practice it until you can use strange force instinctively not on purpose. If you do that one day you might be able to combine it with your great mighty Uchiha taijutsu who knows" she said playfully.
Tsukiho ignored her comment and looked at her eyes. "Let's start Tsuna-chan."
"Well then I'm going to start from the beginning even though you have already done these before."
"Alright"
Tsunade let her all chakra to gather around her. "Without enough chakra control and a huge chakra reserve you can never do that" she said when she saw Tsukiho's sharingan activated.
"Understood" she closed her sharingan. And let her all chakra to gather around her but it wasn't intense like Tsunade as a very thin blue line appeared around her skin.
Then she understood the difference between a Senju monster and a normal Jonin since her chakra reserve also considered Jonin rank in leaf village.
Then she remembered her mother's chakra and compared it with the person before her. Though it wasn't intense as this one it wasn't far from it. Then she understood Tsunade was slacking off since there was more than two decades of age gap between them.
"You are slacking off Tsuna-chan" she rolled her eyes.
Hearing that Tsunade's eyes started to twitch. "You brat, do you want to train or find a fault with me? Ha"
"Of course I want to train Tsuna-chan?" She said with an innocent gaze making Tsunade's eye brows twitch again.
"Now slowly guide them in to your body."
"Alright" she did it very quickly as she familiar with that.
"Very good, it is very impressive feat that you could do it in less that forty seconds. Without letting waste of any chakra" Tsunade complimented. "Can you do it more faster than this?"
"Okay" Tsukiho repeated the process.
"She learnt it after looking at a whirlpool. So of course she is doing it perfectly." Yuna commented from the sidelines.
"So that's why it is very smooth. Controlling chakra around tenketsu points like a whirlpool. How did you come with that theory?" Tsunade asked. "Did you teach her that?" As an answer Yuna shook her head.
"It is very simple, whirlpool suck everything near it" Tsukiho said with deadpanned eyes.
"Do you have weights in your legs" Tsunade asked.
"Yes, six at each. Mom said it is the limit for my age."
"Good now do your normal exercise routine with strange force. And no shadow clones anymore" She sharply look at the child.
"Alright" she gulped her saliva and went off.
Then Tsukiho started to punch a quite strong wall at first. Before that she reinforced the wall with a barrier seals. So it won't break easily like the the grounds she had shattered before.
Then she started to punch and kick with chakra enhanced strength. 'Focas the chakra through the meridians in fist and then condense then in the fist then let it out from hand and then guide them back again after the punch.' She punched while mentally muttering what to do.
After a punch she felt the impact of the blow is very strong. Stronger than her previous version of chakra enhanced punch. 'So this is how it really do that. It is also a compression of chakra but in a different perfect way why didn't I think of that' she paused for a moment.
'It is not that I didn't think of this but the chakra control requirement for this is very high. No wonder others can't do it. It has extremely high requirement even I could do this because I used that whirlpool theory before! It seems very simple but same time it isn't. That's why Kakashi or any Uchiha couldn't copy it. The only drawback is the technique is very slow but once I can do this instinctively I could increase the speed. But it is very long way to go. But with my chakra and once she gave me permission to use shadow clones, I could reduce the years to master it and improve it.' She thought victoriously.