Rov qab Crunch yog ib qho kev tawm dag zog lub cev uas feem ntau tsom rau lub plab plab thiab obliques, ua kom lub plab muaj zog thiab ruaj khov. Nws yog qhov kev tawm dag zog zoo tshaj plaws rau cov tib neeg ntawm txhua qib kev qoj ib ce, los ntawm cov pib mus rau qib siab, uas tab tom nrhiav los txhim kho lawv lub zog tseem ceeb thiab txhim kho kev sib npaug tag nrho. Kev sib xyaw Reverse Crunches rau hauv kev ua haujlwm niaj hnub tuaj yeem ua rau lub cev zoo dua, txhim kho kev ua kis las, thiab txo kev pheej hmoo ntawm mob nraub qaum.
Yog lawm, cov pib tshiab tuaj yeem ua Reverse Crunch ce. Nws yog ib qho kev tawm dag zog zoo rau kev tsom mus rau cov leeg hauv plab. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tau pib qeeb thiab tsom ntsoov rau kev tswj kom zoo kom tsis txhob raug mob. Tej zaum nws yuav nyuaj thaum xub thawj, tab sis nrog kev xyaum tsis tu ncua, nws yuav yooj yim dua. Raws li ib txwm muaj, yog tias muaj kev tsis xis nyob lossis mob thaum ua kev tawm dag zog, nws raug nquahu kom nres thiab sab laj nrog kws kho mob lossis kws kho mob.