You can specify if the player can move while playing one specific animation or not.
Looping animations
You can create animations which would play start -> loop -> end sub-animation.
This allows you to create complex looping animations, for example a sleep animation where your player would lay and stay there until the player presses SHIFT.
Step 1
Create the animation, in this example a death animation.
Right click it and mark it as Loop.
Step 2
Now place the cursor on the frame where you want the loop to start, in this case when the player is on the ground.
Step 3
Click on the Add Loop Start/End marker icon to add a start loop marker.
Now place the animation cursor on the frame where you want the loop to stop and press again on the Add Loop Start/End marker icon.