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People of Lemmy! How to get fit?
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Fit can mean lots of things. What specifically are your goals? Sit down and think about what you really want and be specific. Are there particular sports you want to focus on? Particular fitness goals like be fast, be strong, be muscular, run long distances, etc? Define your specific goals and from there you can create a specific plan to meet those goals. If you have general goals and particular sports you like, it can help to turn your general goals into specific goals in those sports. If you like running and want to work on your endurance, pick a half marathon to train for. Setting specific goals with deadlines helps you define and stick to a specific plan.
If your goal is healthspan, the book Outlive has a great section on planning your exercise for longevity and healthspan:
https://peterattiamd.com/outlive/
Nutrition: eat sufficient protein (more than you think), establish a minimum amount you need based on your lean body mass and activity levels. Use fat and carbohydrates to meet the rest of your caloric goals. Try to avoid "bad carbs" (fructose in sweets and processed foods) and bad fats (trans fats, hydrogenated oils, omega 6 fats from seed oils, again processed foods) but getting enough protein and avoiding excess calories is vastly more important.
Resistance training: this will depend on your specific goals. Hip hinge (squats, deadlifts) and pulling exercises (rows, pullups, deadlifts) are probably the most important. You probably want to plan and periodize your workouts. I am a huge fan of 5-3-1 for strength development. I've tried many programs over the years and this is the only one that doesn't plateau prematurely for me. I do this 2-3 times a week.
https://www.jimwendler.com/blogs/jimwendler-com/101065094-5-3-1-for-a-beginner
Cardio: I break this into high intensity and low intensity. Again, you should tailor this to your goals but generally you want to do 80% of your cardio at low intensity (heart rate zone 2 in the 5 zone mode) and 20% at high intensity (zone 4-5). There are lots of ways to skin this cat depending on what cardio activities you enjoy. I do 1-2x 20 minute high intensity workouts a week and 2-3x hour long low intensity workouts a week.
As others say, start slow. Add one of these changes at a time and give your body a few weeks to adapt before adding another change.