There are a few precautions to take:
1) First of all, you should not be running long distances if you did not gradually (over many weeks/months) increase the distance you are running. If you try to dramatically increase the distance you run in a short time period, your risk for injury of all types will go up - including calf injury.
2) you should be adequately stretched out before you run - in this case stretch your gastrocnemeus (calf) as well as your soleus (muscle under the calf). to stretch your soleus, bend your knee before leaning forward with your foot flat.
3) Do your long run on a surface that you are trained for. If you are used to running on the cinder grinds of a track, then try to run long distance on road pavement, you will be more likely to feel calf pain.
4) Be sure your running shoes are appropriate for your feet and your gait. Also be sure your running shoes are not too old. Old shoes lose shock absorbing ability.
5) Proper Biomechanics. This is very complex and beyond ability to convey in written form.
6) Be sure you have had sufficient rest prior to running long distance.
Good luck!
You can make your thighs and legs skinner without gaining any muscle by running long distance
skeletal muscle
The distance a muscle can shorten
skeletal muscle
it's important to rest your bicep muscles so they heal quickly and without further complication.
You will not get muscle without a proper diet, and exercise program. You will need to eat more proteins to build muscle fast. You can buy a testosterone boosting steroid from body building.com
Generally the cause of cramp is not having enough salt in your diet.
Sex
If you are having muscle spasms and are looking for a way to relieve these symptoms without having to go to a doctor's office, simply take a long hot shower or bath, 2 tylonal extra strength and relax your muscles.
If you are asking what does someone mean when they say "I have muscle," it is slang for having a muscle "stick out" when you flex it.
They contract very quickly
This is because building muscle takes a long time if you choose to stay natural, that is, without the use of anabolic steroids. On average you may build 5-10 kgs of muscle or 8-20 pounds of muscle in your first year, and from then on in, it gets a lot, lot harder. :)