Getting your students to burn off some energy before the start of your lesson is very good advice.
The following ICALwiki articles will give you tips and ideas on how you can do that successfully.
The Warm Up Game - ICALwiki Simon Says - ICALwiki
Miming can also be a useful technique to get their attention and keep them involved.
Miming in Class - ICALwiki
and, if it all fails, you try this:
Red Card Yellow Card - ICALwiki