its really a matter of preference when you run the clen, though post cycle is what most will reccomend. You can run thermorexin during and after cycle, IMO use during cycle has both partitioning and training volume benefits. It can be stacked with clen (helps significantly with clen related lethargy).
if running clen dont forget
ALCAR- heart
taurine- cramps
potassium- cramps
magnesium- cramps + heart