Free Upgrades.. / elixir

Here is an obvious one but just to make sure everyone knows...
When researching new troops all troops in your camps get upgraded for free, but also troops in your barracks when your camps are full are upgraded.

So before your research completes, when your camps are full, train as many of the troops you are researching as you can, after the research is complete cancel them down and you will be credited the new elixir value.

Every little helps.!

ohh yeah good way to get elixir!!!