Aswitheveryepiso□eofRunni□gMa□,□he2□13□421□pis□□ewasfi□□□d□ithaseriesofchallen□esand□ames□□att□s□edthewit,s□r□ngth,andt□amworkofthecastmem□ers.Fromintenseph□sicalchalleng□stobra□n-teasingpuz□les,thecastha□toworktogethe□toov□rcomeob□□ac□esandeme□g□vic□orious.The□om□e□itive□pi□itwashigha□□hecastmember□threwthemselveswhole□earte□lyinto□ach□halle□g□,d□t□rminedto□u□smartandoutperformtheir□ppon□□ts. As□itheveryepisodeof□unningMan,the2□130421□piso□e□asfilledwit□a□e□ies□fc□allenges□n□game□t□at□estedth□□it,s□r□n□th,and□eamw□rkofthecastmembers.F□omintensephy□ical□hallengestobrain□t□as□ngpuz□l□□,the□as□h□dtoworktoget□□rtoovercomeob□tacl□s□nde□erg□vic□orio□s.Theco□p□titi□espirit□ashi□ha□th□cas□me□ber□threwthem□□lv□swhol□hearte□lyint□ea□hchalle□ge,□eterm□nedtoouts□artan□outperfo□mt□eiropponen□s.<□p> A□with□ve□ye□isod□ofRunningMan,the201□0421episodew□sfill□□□it□a□eri□□ofchal□engesand□ame□tha□tes□edthewit,strength,an□t□amwo□kofthecastm□mbers.Fromint□nsep□□sicalc□allengestobrain-teasingpuzzles□t□ecast□adtoworktogethertoove□comeobstaclesande□ergevict□ri□□s.The□ompeti□ive□□iritwashig□a□thecastm□mbersthr□wth□mselve□wh□□ehearted□yintoeach□hall□nge,det□□m□nedtooutsm□r□andoutper□ormthei□op□on□n□□. A□□ith□veryepi□odeof□unnin□M□□,the20130421episod□was□i□ledwi□haseriesofc□alle□gesandga□est□attested□he□it,s□rength,□nd□eamworkofthecast□□mbe□s.□romi□tensephy□icalchalle□gest□br□in□t□a□□ngpuzzles,t□ecas□h□dtoworktoge□□ertoovercomeobs□□□lesan□emergevictorio□s.Thecompetitives□i□□twashighas□hecastmembers□hrewthemselveswholeh□art□dlyintoe□chchall□nge,d□t□rm□□e□tooutsm□□tandoutp□rf□□mt□□iropponents.