No activity outside of the gym? Because you’re lifting 5-6 days per week? With your long rest periods, you’re likely not utilizing more than 3-400 calories per session. Why not go with something easy for starters- accumulate 10,000 steps per day, minimum. I believe 15,000 per day, per week, utilizes approximately 3,500 calories, which is enough energy expenditure to lose roughly 1 pound of fat per week. Easy.