Japanese by Example
Learning through examples in manga

Besides, it's just practice with それに〜

それでも歩は寄せてくる » Volume 11 » Page 122

Urushi plays three games of shogi simultaneously against the other members of the shogi club. After winning against all three members, Urushi fears she’s destroyed their confidence, and just before the upcoming tournament.

うるし:
「いやいや!!みんなよくやってたぞ」
"No, no! You guys did great!"
それにただの練習(れんしゅう)だ」
"Besides, it's just practice."