McGirt Jr. has been working with strength and conditioning trainer Marianne Chaubirka the past two months and has added four pounds of muscle .
Jr. hopes to be ranked in the top 10 by the end of the year .
McGirt Jr. , who hopes to be ranked in the top 10 by the end of the year , has been working with strength and conditioning trainer Marianne Chaubirka the past two months and has added four pounds of muscle .