Weight gain despite exercise

[smookedtrout]

Last mind I exercise with a set of weights, and have noticed that the more I do these exercises more weight, the truth is that I do it for free, I mean that I have no idea of the exercises I abide by the instructions of the manufacturer, is up two kilos normal even though then I dedicate an hour to walk and run
thanks
ps: I make normal diet, before that I kept my weight