The biggest "do" of fitness is to get involved in an activity you enjoy. Make sure you have a plan and a goal so that you follow through with your desired activity. Often combining physical fitness with being social makes it easier to motivate yourself out of your house or workplace and into a more rewarding lifestyle.
It is important to warm up for 3-5 minutes (10 minutes if over the age of 60, obese or deconditioned). This will allow you to focus on the workout ahead, warm up the muscles (reduces the risk of injury) & raises heart rate slowly (allowing you to perfom at peak levels for longer durations of time).
Avoid eating large quantities of unhealthy/fatty foods before being active. Eat food high in carbohydrates such as pasta because, carbohydrates will help your body to maintain engery.
On top of drinking water also you need to replenish the salt in your body because, when you sweat you also lose salt and the chemicals in salt help your muscles contract. Drinking excess amounts of water with out repenlishing your salt's will cause your muscles to cramp
Another important factor in excire is going within your limits. For example while lifting weights you need to work yourself up to the higher weights by starting with low weights.
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