Gud evening, pls share in detail about your personal goals,if u r trying for two things at a time then pls let me know about your detail food habits.in both the conditions,u need to have a healthy lifestyle habit then only u can gain muscle mass as well as loos specific area fat loss,do strength gaining cardio work out for muscle mass gain,for loosing stubborn fat in specific areas u can do either jogging or tread mill running, cycling, push ups,crunches, yoga etc for minimum of 45 mins n max 1hr.
Next Steps
if u need further thorough guidance ,then u can connect through practo.