Do it on training days, but seperate it from the weights. After lifting its crucial to feed the machine and start recovering. You don't want to be doing cardio for another 30+ min when your muscles need nutrients. I find doing cardio in the morning is best for me, and it gives me plenty of time to rest before lifting. It also energizes me for the day. But on rest days, make sure you rest. I'm a firm believer that overtraining is caused by lack of rest and nutrition. This is also why they don't grow.
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Thanks thats what i was kinda thinkin of doin cuz i work mornings and i lift after work so yah should be a perfect routine. Thanks for the help