To defeat the Jew IRL, you must defeat the Jew within yourself.

How to better yourself:

Go to the gym at least three times a week, and fill the other days with physical activity as well.
Take up one of the following physical hobbies to do on off days:
>Competitive Intramural Sport (soccer, football, basketball, lacrosse, etc.)
>Competitive court sports (tennis, badminton, racquetball, jai-alai)
>Natural activities (hiking, trail-building, rock-climbing, kayaking)
>Endurance/Conditioning (swimming, running, marathons, sprints, 5Ks)
>Combative sport (martial arts, wrestling, grappling, Jiu-Jitzu)
>Game sports (golf, skeet shooting, disc golf, archery)

If you do not participate in at LEAST one of these activities, you should start. Many of these are easy to pick up and have a thriving social community about them. Stay active, develop hobbies, and make friends at the same time.
This is the very good /fit/ Sticky and /sig/ sticky. Skip to the exercise section for some good starting routines if you’re new.
http://liamrosen.com/fitness.html
http://4chanfit.wikia.com/wiki//sig/_sticky

Stop consuming unnatural foods. Fast food, shit packaged food like potato chips, Doritos, candy. Instead, your snack food should be things like beef jerky, pistachios, almonds, raw spinach, carrots, cheese.
Eat fruit. Eat steak, eggs, nuts.
Eat veggies. Eat veggies that you grew yourself.
Eat fish. Eat fish that you caught yourself.

Stop drinking $8 craft hipster beer. There’s a reason they’re big right now, and it’s because the ATF doesn’t make them put nutrition facts on the cans. All those IPAs and Doubles and Stouts and craft shit usually hover around 30g carbs and 300+ calories each. If you want to drink, enjoy a dry red wine or dry white wine, or bourbon, scotch, gin in a simple cocktail, or, preferably, on the rocks/neat.
Do not drink soda, ever. The only acceptable drinks are water, coffee, wine, and whiskey/gin (occasionally).