After the trainee gets used to this, dumbbells can be added for additional load. (anymanfitness.com)
When you are doing a plank, you can not add additional load and increase the resistance, like you do when training with weights. (fitnessandpower.com)
And as usual, the saloon format means that the standard boot space is your lot — there's no folding the rear seats down for additional loading space. (autoexpress.co.uk)