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I am beyond 50, and when I have taken my daily dosage of 1 gram of 1:50 tongkat ali extract, I do double the number of pull-ups, compared to when I am tongkat ali sober.

The strength gain is greatest after the second day of a tongkat ali cycle, and it lasts for about two additional days after I have ended a tongkat ali cycle.

The strength gain is greatest for the kind of exercise that requires muscle strength: pull-ups or running up stairs (an exercise form I personally prefer). There is less benefit from tongkat ali for exercise that is more on endurance, rather than strength, for example distance running over flat terrain.

I think it would be most interesting to do a scientific study on the athletic performance enhancing effect of tongkat ali. Initially, a test utilizing an animal model would be appropriate, e.g. a forced swim test for mice. In such a test, it could easily be determined and measured what effect tongkat ali has on athletic performance.

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1 Shabsigh, D, The Female Sexual Function Index (FSFI): A Multidimensional Self-Report Instrument for the Assessment of Female Sexual Function, Journal of Sex & Marital Therapy Volume 26, Issue 2, 2000, pages 191-208

2 Catherine Ulbricht, An Evidence-Based Systematic Review of Tongkat Ali (Eurycoma longifolia) by the Natural Standard Research Collaboration, Journal of Dietary Supplements, March 2013, Vol. 10, No. 1 , Pages 54-83

3 J O Holloszy, Biochemical Adaptations to Endurance Exercise in Muscle, Annual Review of Physiology, Vol. 38: 273-291 (Volume publication date March 1976)