Endurance deep dive

Sup guys. 
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That time again when getting back into combat sports but the endurance is lacking. Only thing I've used for endurance was Cardarine and injectable carnatine which worked. Any other recommendations? Heard Stenabolic also being a good option. Much appreciated gents! 

Slu pp 332 is also quite good, MOTC the peptide aswell, but unsure of which labs have got those locally these days

Only brand I know of selling SLU PP is Ipharma but with their recent bust I'm sure it's no longer available

and i am currently trialing out that product, and i have a feeling that it is bunk, from the results and feedback from others, the price was a but of a tell tale sign

Thanks for the feedback! Going to try SR9009 before going back to the regular Cardarine to see if it could be better than Cardarine.