is it ok to train legs say 30 min after glute injection???

[dec11]

Yes it is possible but you will pay a price for that.
Personally I learnt:

1. Never train the muscle you injected on the same day of the injection.
2. Do not inject a muscle trained the day before.

have to ask, why? its never affected me at all and ive pinned groups almost straight after training them

[BJJ]

have to ask, why? its never affected me at all and ive pinned groups almost straight after training them

The reason is purely personal I guess.
Maybe, being my first cycle my muscles are not used to the injections and so are too sensitive. Just guessing...

Anyway, it is my experience.