I had one for a while but found skipping suited me better (it's a very high cardio burner). Trampolining is great cardio exercise, I understand it may put strain on pelvic floor muscles - however I've only read that in passing somewhere and am not sure if there's any shred of evidence behind it.
Re diets, I've tried many of the years but the best I've found for me has been the Weight Watchers Fit and Healthy, which I understand is similar to Slimming World. It's not about counting so much, but basically eating healthy. We haven't eaten anything out of a box for a long, long while (apart from high fibre Shreddies) and we're feeling so much better for it. My oldest daughter has suffered badly with eczema since a baby and it's cleared up massively as we've cut down on dairy products. Meals are cooked from scratch and made mainly from vegetables, vegetables, vegetables and meat - and very little refined carbohydrate. My energy levels have definitely improved as well as my waist line and although I don't particularly need to lose weight, this has become a way of life for us - I'm sure it's good for my teenagers too.
Are you following any particular diet plan ?
GG x