I know that for a complete exercise, you need to concentrate on many muscle groups. For example, extreme abs training with no back exercises can cause serious posture problem in the long run.
My question is, is it enough to do biceps curls for biceps and push-ups for triceps to completely work the upper arms out? Or should I include extra triceps exercises like triceps extensions?
If it helps, I am 171cm/69kg. I use 6 kg dumbbells for 24x3 curls. I only use my body weight for 10x3 push-ups. My long term goal is to become lean and fit. I am not interested in putting large amounts of muscle mass.