I too agree varitey is key. But boy what a pump u get when trained together.Nothing like it!!

When I train them on there own, they are ALWAYS stronge in the lifts then when I train each after anothe bp, such as chest, bi, or delt, tri...

BUT when I do train them alone, I sometimes wonder if they are getting 100% recovered, before coming into play on say biceps for back day....

I have noticed an increase in my bench strength, I think do to training tri with chest, my tri are getting more overall recovery, vs before doing tri with delts 2-3 days before chest, my tri's would sometimes tend to give out before my pecs would.