Why are you having me lift weights for fat loss?

Hello Friend,
Any personal trainer or nutritionist or body worker will tell you it is to increase muscle mass which will use any existing fat as fuel. Typically, heavier weights build bulk and lighter weights build smaller, longer muscles.
(See picture below) If lifting heavy weights is strenous, try starting small. For example, a favorite exercise is to fill a gallon jug with water to an amount that is tolerable yet challenging. Then when a gallon of water is too light ... Fill it with sand. Then when the gallon of sand is too light ... Fill it with stones.
Get the idea? Baby steps, it's aaaalllll about the baby steps. Then before you know it ... BAM!
Guess who's binge watching Nikita on Netflix.
Best of luck to you My Friend!

Fat loss requires more than trying to burn as many calories as possible during a workout. In actuality, the body, being the incredible machine that it is, adapts to steady-state activities and begins burning fewer calories during these (typically cardio-heavy) sessions. What's more, it also becomes more efficient at storing fat. So, if your goal is to effectively change your body composition, you need to incorporate resistance training into your fitness program. Research consistently shows that resistance training is more effective for fat loss compared to steady-state cardiovascular activities.