taking clen at the moment and i train mma. when im in the gym i feel like the clen makes my cardio die out real quik just dont feel like clen is a good thing to take if your training mma. i was thinking of getting synthetine and syntheselen and stacking them is this going to effect my mma training in the fact of it hurting my cardio. i seriously feel like giving up and im done after 20min while on clen this is terrible i train at ATT and the class works you but i would get thro a class sometimes 2 back to back my coach is looking at me like whats wrong with me