Isibhakela(noma inqindi) yisandla lapho iminwe igobile ibheke entendeni yesandla futhi ibanjwe lapho ngokuqinile. Ukwenza noma ukugoqa isibhakela ukusonga iminwe ngokuqinile phakathi nendawo yesundu bese ubambelela isithupha phezu kwamaphalange aphakathi nendawo; ngokungafani nalesi isibhakela "esivaliwe", umuntu ugcina isibhakela "sivuleke" ngokubamba isithupha ngasohlangothini lomunwe wenkomba. Umuntu usebenzisa isibhakela esivaliwe ukushaya ama-phalanges aphansi phezulu, noma ukushaya ngohlangothi oluncane lwesithende sesandla; umuntu usebenzisa isibhakela esivulekile ukungqongqoza ngesigaxa esiphakathi somunwe ophakathi. Ukwenza isibhakela cishe akwaziwa phakathi kwamanye ama-primates.Lokhu kungenxa yokuthi ngenkathi "iningi lezinyamazane zinde entendeni nasemunweni [futhi] zishoda ngesithupha", ubukhulu buphikisana nabantu. Okungenani ucwaningo olulodwa luye lwasho ukuthi ukuvalwa kwengqindi yomuntu kungasetshenziswa ukukhumbula imininingwane. Olunye ucwaningo lukhombisile ukuthi ukwenza izibhakela kungasiza abantu ukuthi babhekane nengcindezi noma ukukhathazeka ngoba ingqondo iba matasa ngokuqina kwemisipha ukugxila odabeni olusondele. Ukwakhiwa kwesibhakela ngenhloso yokushaya isibhakela ulwazi oluyisisekelo kakhulu olufundiswa emdlalweni wesibhakela. Izibhakela zifundiswa kwezobuciko obufana nekarati, i-kung fu, ne-taekwondo ngenqubo yokushaya isibhakela nokuteleka.