Where do I start?
Just begin with something simple. If you are 13, you should probably go with the nerdfitness mentality of freeweights and bodyweight training. Make a schedule up.
Test yourself and see what you are capable of. How many pushups can you do? How many situps? How fast can you run a mile? A 50 yard dash? Squats?
If you're anything like I was at 13, I'd recommend doing this:
Every other day3 sets of 10 pushups
3 sets of 25 situps
3 sets of 20 squats
3 sets of 3 pullups
(Tune to your personal fitness level, of course)
Once you're in your routine, add cardio on the opposite days. Run a mile every other day.
Considering you are 13 you may have not reached your growth spurt yet. Additionally you probably need more protein in your diet instead of carbohydrates. I don't really know you but I am guessing you probably don't do much physical activity. Eating lots of grain's is part of a healthy diet because they give you energy but eating only carbs is not healthy. Besides fruits and vegetables which help keep your body clean and protected from diseases, protein from meats but also other foods like rice/beans are necessary for growth. Protein helps build muscle but you can't just eat protein and expect to gain mass. You have to work out to use the eaten protein for it to be translated into muscle.
@axolotl
Do what he said, you shouldn't go paleo imo.
Im doing this stuff for skateboarding, not parkour, its essentially almost the same thing
over the past month I snapped my board and out of depression (not really) I started eating and being on the computer too much and once i got back on board I was like "holy stuff im fat"
im almost a bit overweight, I have moobs and a hugeass gut, I just wanna tone that down.
Oh well then yes, you should do some running and bodyweight training.
By the way guys, please register on the site because I am a shallow pool of information. The guys on that site are extremely knowledgeable, and will jump at the chance to help a newcomer get into fitness. They did for me.
