Copy<br>Fred looked at the diets of various athletes. And impressed by the high amount of calories they ate per day. Fred decided to copy their diets and workout routines. But he felt himself getting sick and weak. Fred went back to his normal diet and his health improved.
Fred stopped exercising when Fred went back to his normal diet.
We are told Fred went back to his normal diet - we don't know if he continued "copy their ... workout routines"
( z1 stop :ARG0 ( z2 person :name ( z3 name :op "Fred" ) ) :ARG1 ( z4 exercise :ARG0 z2 ) :time ( z5 go-back :ARG1 z2 :ARG2 ( z6 diet :ARG1-of ( z7 normal ) :poss z2 ) ) )