Slightly unusual deal which is only relevant to people looking for David Lloyd or Nuffield gym in pricey areas.
In Oxford, Nuffield is £88pm and the most basic plan with vitality is £35 which gives me 50% off. (£17 savings per month)
Additionally, if you want to do the vitality points seriously you can get prime free (£7.99pm) and a free Apple watch if you pay over £45 for vitality.
I save about £25 per month doing this, but alot of these gyms are cheaper.vitality.co.uk/