Working out is a Vicious Cycle !

Ya know working out really sucks, I can barely move today BUT I know if I do not do it again It will be worse tomorrow , so in order to NOT be sore tomorrow I need to keep doing it . Its a evil thing ! My p90X schedule is for Shoulders arms and the AB RIPPER ! WTF ? What the hell is an AB RIPPER ? I can barely walk today ! And my arms and shoulders are probably the worst from just Cardio yesterday , NOW They want me to FOCUS On arms and Abs to the point i RIP Them ? OMG !