A substance, typically a synthetic hormone such as testosterone or human growth hormone, that makes the human body stronger, faster, and able to recover from workouts or injuries at a faster rate.
exercises
How could you determine your testosterone levels without performing a lab test? Moreover, exercises are not related to your testosterone levels, unless you have a trouble on this issue. Safe exercises are related to your cardiovascular health, no matter how much testosterone is flowing in your bloodstream.
One can find brain exercises in order to increase brain age very easily. Some very interesting web pages related with are "Free Brain Age Games" and "Family Health Guide".
flexibility
Flexibility -----A+
Some of the exercises that are good for the back can be found on the Spine-health website. You can also check with your local chiropractor for help with exercises designed for you.
Parkour exercises are demonstrated and explained via the website in the Related link.
There are many different types of exercises that are good for lumbar and spine health. Some of the more popular and basic are bike riding, swimming and Tai Chi.
health
Organization such as Men's Health and Men's World provide great back exercises. These back exercises are very trustworthy and easy to implement. There is no cost in viewing these information.
There isn't a quick way to recover from knee related injuries or pain. You have to keep doing knee related exercises, such as bending and stretching.
Mobility exercises should be done to improve ones health. They help build muscle and help with a persons flexibility too.