Studies that have examined the effects of compression stocking on athlete's performance have been carried out in a single test, i.e., the athlete's was examined during running/riding/jumping with and without the compression stocking.

Yet, using the stocking during all training session and for longer period of time might further enhance the performance. Compression stocking were found to have a positive effect on the athlete' recovery. We hypotheses that if the athlete will train with the stocking on a regular basis and his/her recovery will improve, it will also improve the performance. In addition, the athlete's body may need an adjustment period to use the compression stocking. As such, the advantages of using compression stocking might only be revealed after training with the socks during a period of time and not just performing the tests/competitions with it.

All runners will be examined for: demographical parameters, time of 5 Km run, distance of forward jumping with two leg.

The sample will be divided into 2 research group: research group - all training with compression stocking and control group -training without compression stocking. Both groups will continue their training program for 8 weeks according to their coach. A second examination for the same tests at the end of the 8 weeks.

Inclusion Criteria:

• Runners with at least 3 years of experience and background in competitions (participated in at least 5 competitions participated).
• Train between 4-5 time per week, for minimum of 40 minutes and a minimum of 8 km per training.
• Running minimum 35 km per week.

Exclusion Criteria:

• Runners who practiced in the past with compression stocking.
• Complains of lower limb pains
• Medical history of lower limb or back surgery.

3 months following study completion

participant and investigators are not blinded for research groups participants.