If you are looking for a real challenge, then try doing the RKC Plank. Invented by a former Soviet special forces trainer, ...

The plank has long been considered one of the ultimate tests of rock-solid core strength. But beyond the classic straight-arm and forearm versions, there are plenty of variations that challenge your ...

Our reporters have teamed up with fitness experts to design dozens of routines. Try something new — and build an exercise habit that sticks.

Simple, equipment-free routines for beginners to build strength, flexibility and heart health at home, with safety tips and ...