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Since you did neglect to incorporate the two biggest lifts (squats and deadlifts - and I agree with Phil, they should be staples) I can only assume that your current goal(s) are not to build strength but to build muscle / general fitness. In that case, you could aim for 3 sets of 8-12 reps like you have been doing, or 4 sets of 8-12 reps for compound movements (squats, bench, etc.) and 2 sets of 10-15 reps for isolation movements (flys, leg extensions, etc.)
When I'm not doing old school full body workouts, I use this split:
Monday - Chest / Bis / Abs (can add forearms if wanted, but direct forearm work isn't usually necessary).
Tuesday - Cardio (AM & PM)
Wednesday - Legs / Shoulders
Thursday - Cardio (AM & PM)
Friday - Back / Tris / Abs
Saturday - Cardio (AM & PM)
Instead of re-inventing the wheel, maybe hit a site like muscleandstrength.com and pick a proven routine developed by an experienced trainer.
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