Its very important to learn your after and before workout snacks to get maximum benefit from work out.Eating wrong after and before work out is not going to give you a good result that you are looking for.So a healthy diet plan is a must.Its better to have a mix of simple and complex carbs so that the release of energy during your workout is slow and steady through out the routine.For this always couple a fruit with whole grain toast.After a strength workout too our body demands energy which can be fullfilled with a protein shake coupled with a carb or a protien heavy snack with a complex carb,which must be again a whole grain .