If you want to slim down, skip the cardio machines and do high intensity weight sessions. You can follow that up with light cardio...walking not jogging...on the treadmill. That light cardio will help burn off the triglycerides (fat in your blood) your body released from fat oxidation during high intensity exercise. Long duration, steady state cardio increases cortisol in the body and leads to fat retention and muscle degradation.
If you want fat loss without weights, do HIIT cardio (high intensity interval training). Go all out (sprint) for 20 seconds then walk for 40 seconds (active recovery), repeat for 10+ intervals. As you get in better shape, reduces your active recovery intervals incrementally, striving to sprint for as long as you recover. When you get in really good shape, aim to sprint for twice as long as your active recovery.
A great high-intensity weight lifting program is called "Advanced German Body Composition". I'm currently running this program and it is brutal, but in a good way. https://www.t-nation.com/workouts/lactic-acid-training-for-fat-loss
Your best exercises are going to be compound (multi-joint) lifts...squats, deadlifts, presses (overhead and bench), pull ups, etc. Dumbbells are better for building muscle (except for deadlifts and squats), barbells are better for building strength. Your body is meant to work as a system, so don't load up on a bunch of isolation exercises like bicep curls.
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