Given the question: What key details about alexander vasilyevich tkachyov can be extracted from the following bio? Bio: alexander vasilyevich tkachyov -lrb- -rrb- -lrb- born november 4 , 1957 in semiluki , voronezh oblast , russian sfsr -rrb- was a soviet/russian gymnast and two times olympic champion . he trained in dynamo , voronezh . his trainer was ussr national pyotr fyodorovich korchagin . tkachev was one of the world 's strongest gymnasts between 1977 and 1981 . in 1977 tkachev performed for the first time a gymnastics element on the horizontal bar , which was later named '' tkachev '' after him and became one of the most popular and impressive elements , frequently used on international gymnastics competitions . in 2005-2006 , he coached girls ' compulsory program at peninsula gymnastics in san mateo , california .
The answer is:
- imagesize is 150px- birth date is 04 november 1957- name is alexander vasilyevich tkachyov- discipline is mag