Uhm, try another type of cardio exercise. Why, you ask? Your body's not adapted to it yet. Like I lost 40lbs from dieting and ice skating everyday, right, but then the weight loss stopped after a while. Why? Partially cuz I got less strict on the diet, but partially because my body's adapted to ice skating. Now what I used to be huffing and puffing around the rink, I can do half asleep. People don't take this into account with exercise and calories spent. Your body's adaptation. So running, unless you do more running or a different kind of running (ie, sprints) your body has adapted to the workload you've placed on it, and it's part of just the daily routine. However, if you find a different activity, you'll then have to adapt again to it, and you'll lose weight in this process. For example, my friends will huff and puff walking up a hill, and I can just be walking and it'll just be conversation pace for me. John Broz, an Olympic lifting coach, I love his metaphor on adaptation, mind you he's crazy as f**k (as are most high level Olympic lifters) but I think the metaphor is a good one.
Quote:
If you got a job as a garbage man and had to pick up heavy cans all day long, the first day would probably be very difficult, possibly almost impossible for some to complete. So what do you do, take three days off and possibly lose your job?
No, you'd take your sore, beaten self to work the next day. You'd mope around and be fatigued, much less energetic than the previous day, but you'd make yourself get through it. Then you'd get home, soak in the tub, take aspirin, etc. The next day would be even worse.
But eventually you'd be running down the street tossing cans around and joking with your coworkers. How did this happen? You forced your body to adapt to the job at hand! If you can't' squat and lift heavy every day you're not overtrained, you're undertrained! Could a random person off the street come to the gym with you and do your exact workout? Probably not, because they're undertrained. Same goes with most lifters when compared to elite athletes.
– John Broz 2002
So pick any activity you've not done before, and do it.
As far as diet, I can't give a ton of recommendation. I managed to lose a lot by cutting calories, and eating more protein and lots of veggies and fruit, with little carbs. I'd say not cut out whole food groups, and more just cut caloric intake. You can do keto diets and crap like that, but I don't feel like those are good if you're athletic as I tend to feel like s**t on them. Your results may differ. I'd say for quicker weight loss, you can pretty much just eat a ton of veggies and fruit, like eat as much as you want, and the pounds will come off, as veggies aren't very calorically dense. One thing regarding carbs, carbs aren't bad, but some carbs are better than others. Like rye bread is better than wheat, for example. Wheat in particular, the kind we have now, dwarf wheat, isn't good. So for carbs, I have better luck with starchy veggies like potatoes, planning to make my own rye bread, though.
I think the main important thing diet wise, if you don't already do it, is avoid processed food. Cook everything you eat yourself from scratch. I can usually maintain weight if I cook everything myself, regardless of caloric intake, but then give me fast food or frozen food and I balloon. So, main thing is just learn to cook.
EDIT:
As far as losing weight, don't try to "lose weight" try to lose fat. I'm 195lbs at 5'9, but I'm 18-20% bodyfat, which is not a great bodyfat number, but it's not a bodyfat people immediately go "omg so fat!!11" at or anything. But for me, if I tried to fit into the BMI scale, it'd be concentration camp weight for me. So assuming 19% bodyfat, my lean bodymass is 158lbs, my weight with no fat. So with ZERO fat, my BMI would still be 23. I'd have to be at like 6-7% bodyfat to even hit a 25 on the BMI scale. I settled at 195 with weightlifting, before that I was 180 at likely the same (or possibly higher?) bodyfat. Most people would say I look better with the added weight, because it's not fat, tshirts fit better due to wider shoulders, etc. So try not to look at it as "pounds" and try to look instead for losing fat.
If you wanna do weightlifting, it'll help you lose weight, however it's sort of hard, as you end up going through "bulk" and "cut" cycles. The best thing weightlifting does is raise your metabolism, but in itself, it doesn't burn lots of calories, it burns some (especially Olympic lifts) but the main thing is a better metabolism. I can eat like everything I see and not gain much weight now. The other thing too, as I said in the above paragraph, you'll likely gain more weight on the scale, too.
Good luck! I've still not attained "beach body" but that's due to reasons of other than my exercise plan, like not getting enough sleep and being super stressed.