When they are about to eat a black shadow come from Xin back and he heard a voice
????,"Bwahahah just like I predict your already going to eat your lunch here .. kid let this grandpa of yours take lunch with you guys"
It was garp surprisingly he just casual sitting in front of them ,and take food and start eating
Hina and Ain already know how shameless is Garp so the just pretend that they did not see him.
Xin said,"Grandpa Garp what are you doing here i know that you did not only come here to get food from us"
Hina and Ain have puzzle look did not know what Xin means
Garp grin at them and said,"From now on Xin kid i'm going to be come your sparring partner for whole month"
He continues,"Zephyr notice that your lack of experience in fighting so we discuss to get a sparring partner for you …. And kid your sparring partner is me and your homeroom teacher Zephyr"
Then he patted his shoulder and grin,"So kid get ready bwahahaha…"
Xin suddenly face became serious he knows the importance of battle experience so he did not object to Garp become his sparring partner.
Garp stand and burp,"Your cooking is always good ...hey kid after you rest come at me in the underground training facility and we will start your 1 month of hell training"
"And remember you need to cook food for me every lunch that's for the payment of my service"
Then Garp left with a satisfied look
Hina and Ain envious look at him
Hina said,"Xin,Garp going to become your sparring partner you need to be careful because that old man always cause trouble"
Ain nod,"Yes ...but this is your chance to get more experience so treasure it"
Xin smile at them and said,"Don't worry after i finish my sparring session I will go and find you guys"
Ain and Hina smile happy because they know that he will help them in there training.
...
After taking a good rest Xin run in the underground facility to meet up Garp upon seeing Garp with casual cloth he knows that he will start a hellish training again.
Garp laugh,"Bwahaha kid your here you need to be ready"
Xin bow his head and said,"Grandpa Garp what do i need to prepare before start sparring session?"
Garp said,"There are things that you need to remember before we start .. first you will not use any bits of your hidden power"
Xin nod
Garp continue,"Second you will use weapon i know that you practicing using staff weapon so you can use it in our sparring"
"Third last while we are sparring you need to try to receive all my attack using your weapon and don't worry i will use moderate strength in attacking you but you need to be careful even i use bits of my strength it will still hurt when it hit you"
Garp suddenly laugh,"And for the last you need to survive my attack for 3 hours bwahahahah kid get ready"
Xin face suddenly pale he knows that he will be in deep trouble but still he gets an iron staff in storage room and face Garp breavely."
Seeing Xin did not cowered he become happy because his own grandson luffy fear him when they doing training
Garp laugh and said,"Bwahahaha let the hellish sparring begin"
.....
His legs turned numb he almost couldn't feel them but he still gritted his teeth and continued, he wants to break past his limit.
Xin did not step back even once he keep receiving Garp attack head on while he was fending Garp attack he started to learn some valuable experience he has some idea in his mind but because he was not used to fighting while calculating his move and his opponent he constantly being hit.
While Garp seeing this he becomes more happy he can see that every minute of sparring the kid improve its mean that he was starting to think before he act but this is not enough he need to over his body using his own instinct.
Once again he was hit and he was down to the floor but he tried to stand up but only got half way up there then he fell down again no longer being able to stand and could only try to restore his breath he know that he reaches his limit.
Although his body is extremely tired his spirit wasn't exhausted at all since he has abundant Reiatsu.
Xin was able to reach his limits . This was precisely because of his abnormally strong will and reiatsu which made him exceed his physical limit, although it was painful he need to stand and continue to do it.
At first seeing Xin can't stand, Garp prepared to directly raise his arm to punch him but suddenly stop he notice something and his eyes flashing with a strange light.
This …
Did he just reach his limit?
This state of his shaking legs made Garp surprised. If it continues like this he will bring all of his potentials. Garp can naturally recognize such a state. It's the state after breaking the limit.
Breaking the limit isn't easy as it doesn't have anything to do with physical power. It's all about willpower.
Garp didn't think that Xin's willpower is this strong while he was still young.
Garp made a satisfied smile than in the next moment returned to his strict state.
After Xin restored his strength they resumed training.