▁These ▁blocks ▁need ▁to ▁be ▁in ▁a ▁neutral ▁color ▁or ▁a ▁color ▁similar ▁to ▁that ▁of ▁the ▁track , ▁and ▁they ▁must ▁be ▁placed ▁entirely ▁behind ▁the ▁starting ▁line . ▁ ▁Their ▁location ▁needs ▁to ▁be ▁such ▁that ▁they ▁do ▁not ▁inter f ere ▁with ▁the ▁start ▁of ▁any ▁other ▁ath lete . ▁ ▁In ▁field ▁events ▁for ▁this ▁class , ▁athlet es ▁are ▁not ▁required ▁to ▁wear ▁a ▁prost h etic . ▁ ▁In ▁jump ing ▁events , ▁athlet es ▁have ▁ 6 0 ▁seconds ▁during ▁which ▁they ▁must ▁complete ▁their ▁jump . ▁ ▁During ▁this ▁time , ▁they ▁can ▁adjust ▁their ▁prost h etic . ▁If ▁during ▁a ▁jump , ▁the ▁ath lete ' s ▁prost h esis ▁falls ▁off , ▁the ▁jump ▁length ▁start ▁should ▁start ▁from ▁where ▁the ▁take off ▁board ▁and ▁the ▁distance ▁is ▁where ▁the ▁prost h esis ▁fell ▁off . ▁If ▁prost h esis ▁falls ▁off ▁outside ▁the ▁landing ▁zone ▁near er ▁the ▁board ▁than ▁where ▁ath lete ▁land ed , ▁the ▁jump ▁counts ▁as ▁a ▁f oul . ▁ ▁History ▁ ▁The ▁classification ▁was ▁created ▁by ▁the ▁International ▁Par al ym pic ▁Committee ▁ ▁and ▁has ▁roots ▁in ▁a ▁ 2 0 0 3 ▁attempt ▁to ▁address ▁" the ▁overall ▁objective ▁to ▁support ▁and ▁co - ordinate ▁the ▁on going ▁development ▁of ▁accurate , ▁reliable , ▁consistent ▁and ▁cred ible ▁sport ▁focused ▁classification ▁systems ▁and ▁their ▁implementation ." ▁ ▁For ▁the ▁ 2 0 1 6 ▁Summer ▁Par al ym p ics ▁in ▁Rio ,