Start to train first person in Berlin in excellent exercises (3,3)
I believe the answer is:
tai chi
'exercises' is the definition.
(I've seen this before)
'start to train first person in berlin in excellent' is the wordplay.
'start to' says to take the initial letters.
'first person' becomes 'i'.
'in berlin' becomes 'ch' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'excellent' becomes 'ai' (resembles 'Ac', old-fashioned term for excellent).
The initial letter of 'train' is 't'.
'i'+'ch'='ich'
'ich' going inside 'ai' is 'aichi'.
't'+'aichi'='TAI CHI'
Can you help me to learn more?
(Other definitions for tai chi that I've seen before include "Chinese system of self-defence" , "Chinese system of slow exercise for relaxation, balance and health" , "'Chinese meditation involving slow physical exercise (3,3)'" , "Chinese exercises" , "form of self-defence" .)