You need a warm up period and a cool down period, otherwise you will do yourself an injury! If you are running for example, start off with some stretches, then a slow gentle jog, maybe with a bit of interval sprinting if you can, then a cool down at the end with stretches – stretching is very important to avoid muscle injury.

You should start off and END slow…that is why they are called warm-ups and cool-downs!!!!!!!

Hope this helped!
-Lee

Starting off fast is a good way to hurt yourself!

The most effective is actually interval training. Run for 5 minutes, walk for 3, run for 5, sprint for 2… you get the idea.

But if you’ve never done cardio before please go easy on yourself.

i think slow..