Aside from fixing the types of foods you eat (seriously, diet is even more important than what my post subject suggests -- I just wanted to say that the gym was all you needed, even though it's a
damn lie)
Anyway, 240lbs on the decline translates to somewhere around 20lbs on flat bench. Why are you doing decline? If you want lower chest muscles, just do dips. At your weight, knocking out 5 dips will be much more beneficial than doing decline.
Actually -- at any weight, doing dips is overall better.
If you're lifting to lose weight, then I suggest running through the 4 main compounds weekly with 4 sets of 8 - 12 reps. The more reps, the more cardio-like effect it will have. Not to mention, the 8 - 12 rep range will make your muscles nice and purdy for when you shave off the weight (assuming you even care about that).
I don't know how many calories you are currently eating. Your caloric deficit count is dependent on your height, but I'd suggest around 1800 calories per day if you are going to the gym.
If you want to have real results for weight loss, change your diet. Eat lots of protein-rich food that lack in calorie and carb content (chicken, turkey, fish). Eat lots of veggies. Don't eat any fruit. Want a snack? Greek yogurt.
No matter what you eat, keep your calories per day under 1801
no matter what (seriously though, eat stuff with protein -- it promotes weight loss). Go to the gym 3 - 4 times a week. Go for a walk on your off days. Gradually turn it in to a jog.
If you start now, you could healthily lose up to 90 lbs or so (possible even higher) by the end of the year. This assumes that you are strict on your diet, dedicated to the gym, and that you're losing between 1 - 3lbs a week (this number may start at 3 per week for your current weight, but it will slowly work its way closer and closer to 1lb a week [after all, the more fat you have, the easier it is to lose. that is why the number will start dwindling, but don't let that bother you]).
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