Hi,
Your problem has one easy guaranteed solution that may solve other problems that you may have too such as concentration.
This solution is :AEROBICS
Try the AEROBICS exercises 3-5 times a week each for at least 30 minutes , and you will notice a great difference after 2 weeks, GAURANTEED...
Use this formula:
Tube Length=Length of straight parts measured along the longitudinal axis of the tube + Mean Radius of the bend which is determined along the longitudinal axis of the tube *angle of the bend