Pengaruh Program Kompetisi “Ideal Weight Challenge” Tahun 2020 Terhadap Perubahan Berat Badan, Lingkar Pinggang dan Indeks Massa Tubuh Karyawan di Perusahaan Tambang Batu Bara PT “X” = The Effect of the Ideal Weight Challenge 2020 Competition Program on Changes in Body Weight, Waist Circumference and Body Mass Index of Employees at PT "X" Coal Mining Company.