We're not talking crunches. This workout will challenge your midsection in ways you've never experienced before. Be ready to challenge your core. Works Well For: Core. Equipment Needed: Dumbbells, Chin-Up Bar (Optional).
1990
2019
1999
2012
1988
2017
1980
1994
1977
1976
1996
2004
2008
2023
2010
1993
2007
