surely if the gym is boring, then it is not for you
You could try a different routine, quit gym altogether and go for home equipment. If your in to cardio, then the outdoors or swimming is an alternative.
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I read an article a while back that said having a bit of caffeine before a work out is a good idea because it helps you work a bit harder = burn more calories.
I usually drink a couple of coffees before the gym and it hasn't stopped me losing weight.
I took pro-plus for the first time today before my workout, and I managed to squeeze out a few more reps than usual, so I'd say it is having a positive effect. Of course it could just be psychological. I'll definitely be taking it again.