A way to create an overload (and to force even length bounds) is to use boxes. In this video the athlete bounds using 6 inch boxes. The minimal height of the boxes forces the athlete to maintain a long and low bounding technique as bounding too high off of the box will create an unfavorable impact. The athlete uses double-arm action in this video.
![](https://s2.save4k.ru/pic/aPNzT4Wcw4Q/mqdefault.jpg)