You can find Sinatanika Shrine west of the large chasm in East Akkala Plains.
Shrine Location
This shrine is located at 3842, 2300, 0048 in the Akkala region, northwest of the large chasm in the East Akkala Plains.
Combat Training: Sneakstrike
There are swords leaning against the wall up ahead. Take one if needed. To successfully complete this shrine, you need to hit the enemy with a Sneakstrike. To do this, you should push in the left control stick like a button to crouch, then sneak up behind the enemy when it is not facing you. You will need to wait for the enemy to be looking away from one of the gaps in the wall, then try to walk behind it. Draw your weapon, and when you are close behind the enemy, press the indicated button to perform a Sneakstrike.
Next, the enemy will be patrolling the area, so you will need to move more carefully to avoid letting it see you. Perform a Sneakstrike as before.
Shrine Reward
The chest at the end of the shrine contains a Sneaky Elixir.
Check on the glowing object at the end of the shrine to receive a Light of Blessing.