I might have found the sauce, but im unsure.

• SauceNao SourceURL:https://www.pixiv.net/member_illust.php?mode=medium&illust_id=91780030
• Title:東卍ツイログ
• PixivId:91780030
• MemberName:mu
• MemberId:62019185
• Similarity:50.29

Found On Trace.Moe with a similarity of 0.85: - Title English:How Heavy Are the Dumbbells You Lift?

• Title Romaji:Dumbbell Nan Kilo Moteru?
• Title Native:How Heavy Are the Dumbbells You Lift?
• anilist Id:107226