You should definitely continue going to the gym at least 4 days a week. You should give yourself one day off at least every week. The key is to not exercise the same group of muscles every day. Give your muscles time to heal up or they won’t be able to handle the stress from everyday. If you are mostly doing cardio and not strength training, I suggest you do one day where you really push yourself and the next day go light and easy. A great method I have found when it pertains to doing cardio is finding intensities for yourself on a scale of 1 to 10. Level 1 is like laying down or sleeping and level 10 is the absolute max output your body can do. So when you start on the treadmill(it’s much easier with machines since you can set the speed/resistance!) or an elliptical, etc, start yourself on your level 5 intensity. That could be just a regular walking pace or maybe a slower walking pace. After two minutes go up a level in intensity(either by setting the machine a little harder or walking faster) to level 6. Then after that minute go to level 7, then another minute to level 8 and another minute to level 9. So at level 9 you should really be feeling it and you should really be pushing yourself. After one minute at level 9 go back down to level 6. Then work your way up again minute after minute to level 9. After doing this for a set period of time(I usually do 20 minutes total because it is such an intense workout), when you have 3 minutes left you should be at level 9, then two minutes left try to strive for level 10. You might get there or you might not. It really depends on your energy level for the day. But always try to do it, you might get there when you thought you couldn’t! And then the final minute you should go back to level 5 for a cooldown. You can continue doing a cooldown if you want, a lot of machines have that automatic 5 minute cooldown period. I love this method in cardio and I find it highly effective because it doesn’t allow your body to get used to the exercise. As you get faster and stronger you will have new intensity levels so just move them up as you progress. You can’t outgrow this because of that.
You should definitely do weight training at least 3 days a week too. You should break up the workouts into two or more different groups. An example is doing all upper body on one day and then you can do lower body the next day or a few days later. As long as you give your body days of rest in between workouts you will be fine. The more muscle you have the more calories and fat you will burn. You will also feel better and feel like you can do more in the gym and at home too.
I also suggest eating 4-6 small meals a day and make sure most of it is protein, complex carbs, fruits, vegetables, nuts, beans, low fat dairy, fish, and lean meats. Protein is a huge helper in weight loss because it makes you feel fuller for a long period of time and it helps your muscles. The healthier the food you eat the less you’ll want the junk. Don’t keep it in the house and it will be easier to stay on track.