Just be careful and choose who you work with
<iframe width="420" height="315" src="//www.youtube.com/embed/NI0FQtNiFuQ" frameborder="0" allowfullscreen></iframe>
<iframe width="640" height="360" src="http://www.liveleak.com/ll_embed?f=03286af14d58" frameborder="0" allowfullscreen></iframe>
*knackers no idea how to show a vid on here but just google "3 man dead lift" and you will get the idea.