"The playing area shall be a minimum of 150 yards (137.16 metres) from boundary to boundary square of the pitch, with the shorter of the two square boundaries being a minimum 65 yards (59.43 metres).
The straight boundary at both ends of the pitch shall be a minimum of 70 yards (64.00 metres). Distances shall be measured from the centre of the pitch to be used. In all cases the aim shall be to provide the largest playing area,
subject to no boundary exceeding 90 yards (82.29 meters) from the centre of the pitch to be used. "

In addition, the conditions require a minimum 3 yard gap between the "rope" and the surrounding fencing or advertising boards. This is to allow the players to dive without hurting themselves.

とある。
ピッチの中心からバウンダリーまで最低６５yrdその外側に最低３yrdのギャップが要るから
長手方向は問題無いが、横幅は広い競技場じゃないと無理だな

Ａ級の陸上競技場で
インフィールドの幅が７０M＋1.25M*９ﾚｰﾝが両側＋その外側に槍投げ等のフィールドで１２０ｍ前後