卷腹

crunch (physical exercise)

to roll up / roll / classifier for small rolled things (wad of paper money, movie reel etc)

scroll / book / volume / chapter / examination paper / classifier for books, paintings: volume, scroll

to roll (up) / to sweep up / to carry on / roll

to roll up / to sweep up; to carry along / a roll / classifier for rolls, spools etc

abdomen / stomach / belly