As said above, best to use real hormones with a good diet, tren can be added but it's a more difficult compound to keep sides under control.

However I have used Cardarine for a month or two.
Had my blood tests done my lipids were amazing, HDL was really high LDL was really low (cardarine is famous for this).
I've read many reports on running cardarine when on cycle, especially when using winstrol/anavar/... compounds notorious for wrecking your lipids.

Cardio and endurance went up a lot, I wouldn't get winded after doing a few sprints, and I noticed I could do LISS for a longer period as well.

One of the only downsides I experienced was I needed to make sure to time my meals properly or I'd get low blood sugar (hypoglecmia), which is annoying as you start craving a lot of carbs/sugars and feel light headed and dizzy, and if you don't eat in time you start binging on everything in sight which obviously screws up your diet.