Changes in muscle strength, endurance, and reaction of the lower extremities with Tai Chi intervention Author: Li JX, Xu DQ, Hong Y.( Conference/Journal: Journal of Biomechanics Date published: 2009 Other: Volume ID: 42 , Pages: 967-971 , Word Count: 48 METHODS: The TC group underwent a supervised TC exercise program for 16 weeks, while the control group received general education for a comparable time period. RESULTS: After 16 weeks, the TC group showed a 20% increase in muscle strength of the knee flexors and a significant decrease in semitendinosus muscle latency.