Rowing, specifically indoor rowing is very cheap to get started. Nearly every gym in the UK has access to an indoor rowing machine, making it the most accessible piece of kit in the gym environment today.
For an annual on-water club membership costs start from £35 per year, with clubs providing training programmes, social activities, recreational and competitive opportunities, volunteer coaching and the use of facilities and boats. Most clubs will offer subsidised rates for juniors, students and social members. Free taster sessions are also available at some clubs to help give you an opportunity to get onto the water for the first time.