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A new CS:GO game update adds three new console commands that massively help nade training. 

From release notes:

cl_grenadepreview: show a live update of the grenade’s trajectory while the pin is pulled.
cl_sim_grenade_trajectory : Freeze the trajectory of the currently equipped grenade for the specified number of seconds. Useful for studying the path of long range smokes that go out of view.
sv_rethrow_last_grenade: Recreate the last grenade thrown on this server. Useful for testing the same flash against multiple positions.

This is great news for everyone who are looking to improve their nade game. All of this (and even more) was previously only possible if you had your own server with the Practice Mode plugin by Alliedmodders. 

Beloved DonHaci was the first to demonstrate the new commands on Twitter, check them out: