Tracking machine and weight

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Having lost 45 lbs. in the last 9 months, I am now just starting the process of toning.

With all the machine in the gym, I am starting to pick a few to concentrate on. Years ago, I would write down the machine name and the weight and reps so when I went back I knew what where I left off. There are too many machine to remember each individual weight.

With all the new phone apps out there, is there an Android App I can use to help me keep track of weight and rep per machine.