Form tip: “I love doing sit-ups when I have ... Start lying on back with hands by sides and legs extended straight on floor. Explosively sit up, bringing right knee toward chest, right arm ...

This is a low-impact workout, suitable for most people, but if you’re pregnant, or returning to fitness following an injury, ...

The benefits of a strong core are endless, but finding the motivation to get down on the floor for those sit-ups and crunches ... This gets your heart rate up and helps you burn more calories ...