虻倉を買えない貧民は雑巾で代用可やで

5 Minute Towel Workout for Abs, Core, Upper Body
https://www.youtube.com/watch?v=pLHVdZoNJAM
At Home Ab Workout with Towels
https://www.youtube.com/watch?v=YQ4xTLn2xIY
Throw in the Towel - Home Workout
https://www.youtube.com/watch?v=szSMb77hdrs