▁and ▁are ▁used ▁in ▁forms ▁for ▁exercise ▁purposes . ▁Many ▁modern ▁schools ▁have ▁replaced ▁practical ▁defense ▁or ▁off ense ▁movements ▁with ▁ac rob atic ▁fe ats ▁that ▁are ▁more ▁spect ac ular ▁to ▁watch , ▁thereby ▁gain ing ▁favor ▁during ▁exhib itions ▁and ▁compet itions . ▁This ▁has ▁led ▁to ▁critic isms ▁by ▁traditional ists ▁of ▁the ▁end ors ement ▁of ▁the ▁more ▁ac rob atic , ▁show - orient ed ▁W ush u ▁competition . ▁Histor ically ▁forms ▁were ▁often ▁performed ▁for ▁entertain ment ▁purposes ▁long ▁before ▁the ▁advent ▁of ▁modern ▁W ush u ▁as ▁pract ition ers ▁have ▁looked ▁for ▁supp lement ary ▁income ▁by ▁performing ▁on ▁the ▁streets ▁or ▁in ▁the aters . ▁Document ation ▁in ▁ancient ▁literature ▁during ▁the ▁Tang ▁D ynast y ▁( 6 1 8 – 9 0 7 ) ▁and ▁the ▁Northern ▁Song ▁D ynast y ▁( 9 6 0 – 1 2 7 9 ) ▁suggests ▁some ▁sets , ▁( including ▁two ▁+ ▁person ▁sets : ▁du i ▁da ▁also ▁called ▁du i ▁li an ) ▁became ▁very ▁elaborate ▁and ▁' flow ery ', ▁many ▁mainly ▁concerned ▁with ▁a est het ics . ▁During ▁this ▁time , ▁some ▁mart ial ▁arts ▁systems ▁de vol ved ▁to ▁the ▁point ▁that ▁they ▁became ▁popular ▁forms ▁of ▁mart ial ▁art ▁story t elling ▁entertain ment ▁shows . ▁This ▁created ▁an ▁entire ▁category ▁of ▁mart ial ▁arts ▁known ▁as ▁H ua ▁Fa ▁W uy i . ▁During ▁the ▁Northern ▁Song ▁period , ▁it ▁was ▁noted ▁by ▁histor ians ▁this