Apex domains cannot have CNAME records.
Question and response
Question
dig corefitnow.com. NS
Answer
corefitnow.com. 5 NS ns-1327.awsdns-37.org.
corefitnow.com. 5 NS ns-1720.awsdns-23.co.uk.
corefitnow.com. 5 NS ns-1191.awsdns-20.org.
corefitnow.com. 5 NS ns-1289.awsdns-33.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0