Looks faked to me. Real explosion...but it's more like a stunt charge, not a live grenade.
Jumping up in the air, to get low, wow, that just looks choreographed like some "Broadway showtunes" version of what grenade training might be like...and no bearing on reality.
Long time ago though, I did see a moderately similar training footage of some terrorists in North Africa in the 90's. One pulled the pin and threw it to the next guy, who then threw it to two more, and the last guy threw it over a rock wall or something. In description would seem the same as this video. But it wasn't: they were keyed up, they knew it was a real grenade, and when it detonated, they knew it was a full frag.
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