Question about using wrist weights on a cross trainer?

I’ve been doing 30-40 minutes, six days a week on a cross trainer for almost a year and been really pleased with the results. Legs, shoulders and arms have really toned-up and my cardio fitness is much better. I started using 1lb wrist weights and noticed an improvement pretty quickly. I have just got some 2.5lb weights and started using them, but I don’t want beefy arms, just toned arms. Will they be OK? I’m 49kg, 5′4″ and a pretty lean build.












It is only when you heavy weights, say once a month then leave for a month you put weight on or in your cases when you stop permanently