Glucogon: liver and perhaps a few other cell types - but not skeletal muscle.
In muscle, adrenaline plays a triggering role - and adrenaline would be present in the blood in greater amounts with exercise, danger (fight/flight), etc.
Also, locally within the cell, the presence of molecules like AMP (which would indicate lots of activity breaking down ATP) will cause some shape-shifting of the enzymes to favor glycogen breakdown.
Also, in active tissue, the concentration of Ca++ can increase - which also makes glycogen breakdown favorable.
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