Ruben
Normally, Chiho wasn't one to fall for cheap intimidation methods, but at this current point, his limbs felt like over stretched mochi and he *Still* Wasn't done training yet, so when Sousaku bared down on him with his eyes, it did have the intended effect, as Chiho almost pulled back, before listening to the Chunin's words. . . So a simple strength test then, that shouldn't be. . . 

"Yeah. . . Alright then, let's do thi-*Hrrrrgrk.*"

The pressure immediately being exuded wasn't at all what Chiho had been expecting, the boy almost crumpling before he finally started pushing back against the vice like force, not yet managing to do anything more than simply hold his spot in place.

"Y-You. . . S-strong grip. . ."
Susan
"I can make this much worse, but I won't."

He simply said, he wanted to scare him further. Whilst in reality, he could make himself much stronger using Steel Release: Impervious Armour, he wasn't going to do that, he was just doing some cheap tactics to get him to do way better than he was doing. He wanted him to be able to push back a tiny bit. Though he was able to hold him in the same spot for a bit, that was impressive enough, considering that Chiho didn't seem to be all that physically-inclined.

"Come on Shochune-san, I believe in you. You can do this."
Ruben
After a few more moments of constant back and forth struggling, Sousaku could feel Chiho push back with another wave of force, focusing his muscles and all of his upper body strength into his legs as he *Pushed*, Sousaku noting that he could feel even more strain as, even if it was minuscule, he could feel himself being forced to apply more pressure as Chiho managed an imperceptible few amount of centimeters in his endeavors. 

"P-Please don't. . . Make it. . . *Aaaaaah*. . . You're heavy."

His legs digging deep into the ground, Chiho pushed even further, feeling the strain of Sousaku's strength push against his frame.