there is a 24 years old girl who wants to do a cardarine only cycle(she never used any peds of any kind before). She has a wierd heart condition ...she can't withstand cardio exercises for too long cause her heart rate goes to ~165-170 bpm in 5 mins and in rest mode her heart rate goes below 55 bpm. She smokes and has been in the gym for ~3 years, she's quite fit ...around 17-18% bf i'd say. Would cardarine be safe for her?