jimboalee said:That's a cunning photo.
That exercise could be a dumbell twist exercise where the bell is rotated around the body parallel to the floor.
Someone did mention 'core stability', which I prefer to call 'Abs'. This exercise trains the abdominal obliques and Erector Spinae group.
It also gives the Anterior deltoid a good thrashing.
The Anterior deltoid holds the arm in an outstretched position ( holding handlebars ) and occasionally lifts the arm forward to get a water bottle from cage to mouth.
It could also be a dumbell swing from between legs to horizontal and the photographer has caught Lance at the apex of the swing.
This is more likely, on second thoughts, as this exercise isolates the Erector spinae ( lumbar vertebrae - lower back ). It is a dynamic exercise rather than 'The plank' which is a static exercise.
And please note the two machines in Lance's home gym.
A Smith's machine for squats and the smaller machine by the window is a HyperExtension bench.