Do bridges to rid you of back discomfort.
We have a lot of small muscles nearest out spine and not many people alow them to get stretched or worked.
If everybody practiced bridges in the world 99% of lower back injury and surgery would be eliminated.
The most elite for of bridges is stand to stand or back handspring.
Furthermore, you can work up to that bridge everyday for 20 minutes a day and sufficiently work your body into a /fit/ state provided you eat small meals 5-6 times daily and drink lots of water.
>>t. Convict conditioning
<<tl;dr it can take between 1 and 3 years to develop an elite method of bridges that would fix our backs from sitting on our asses all day