Start on all fours. Extend your right arm in front of you and your left leg behind, actively reaching in opposite directions.

The benefit of isometric exercise is that it tends to strengthen your core more than traditional isotonic exercises (when your joints are moving). Isometrics also lend to more stability and tend to ...

One of them is the 3-3-3 method, popularised by coach Gary Walker. ‘The truth is, you don’t need more weight to build muscle after 50,’ Walker says. ‘You need more tension, and a smarter way of ...