Indoor Rowing for weight loss

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I need to restart my diet
I have 30 or more pounds to go
I need another GOTO machine for exercise?

I have bad knees
I already have a recumbent bike 30 minutes a day and
I swim laps 3 40 minute workouts each week

I gain weight when I do strength training

Who has had weightloss success with a indoor rower and how often do you use it