A bicentric, open-label randomised controlled trial (RCT) is planned to investigate whether the use of fitness wristbands in a defined preoperative period prior to radical cystectomy leads to a preoperative increase in participants' physical activity (number of steps per day) up to the day of radical cystectomy.

The goal of the PreAct study is to test whether the use of fitness wristbands in a defined preoperative period prior to radical cystectomy with a daily activity goal and feedback on the achievement of this goal improves the participants' physical activity up to the day of radical cystectomy.

In addition to the fitness tracker, we provide each patient with a smartphone. For each fitness tracker a separate account in a fitness application is set up for (e.g. name: tracker1.0 with the corresponding e-mail address and password). Neither the patients in the Daily activity Goal and Feedback arm nor the No Daily Activity Goal or Feedback arm receive the access data to the accounts. However, the patients in the intervention group receive the access PIN for the smartphone. On this smartphone a messaging service and the fitness application are installed. The patient thus receives, for example the wristband tracker1.0, which is registered with the corresponding access data in the fitness application of the smartphone given to them. For the entire preoperative period, the Bluetooth function on the smartphone must always stay activated so that the fitness application and the fitness tracker are continuously connected to each other. A detailed description of the timing and implementation of the intervention are described in "Study design" and "Arm and Interventions".

Inclusion Criteria:

• Planned radical cystectomy with bilateral pelvic lymphadenectomy and one of the different forms of urinary diversion (continent vs. incontinent; orthotopic vs. heterotopic) in patients with bladder cancer
• Participants age ≥ 18 years and capacity to consent
• Mobile participant who is not dependent on a walking aid
• The participant declares his or her consent to participate in this study by signing and dating the informed consent form prior to the surgical procedure

Exclusion Criteria:

• Karnofsky performance status scale ≤ 70% (with 70%: Care for self. Unable to carry on normal activity or to do active work (Ambulatory and capable of all selfcare but unable to carry out any work activities). ) (Range: 0 - 100 percent with 0 percent "participant´s death" and 100 percent "no disabilities"
• ASA Physical Status Classification: ASA > 3 (3: A patient with severe systemic disease)
• ASA 1, 2, 3 if acute or chronic diseases of the musculoskeletal system or the central nervous system are involved that result in a symptomatic restriction of motor and / or, in the last case, neurological function (healing ruptures and fractures, Parkinson's disease, multiple sclerosis, etc.)
• Emergency intervention