Aspects of fitness are easier to maintain than they are to continually improve. A maintenance program allows you shorter workouts and less frequent sessions. The intensity of training can be maintained or increased. Two to three adequately designed sessions of 20 to 40 minutes can achieve either of these outcomes. Particular times of the day and particular days of the week are busier than others.
More people means more time per workout.
Analyse the times you workout and seek the advice of the Club or Gym for quieter days and times. This may provide the opportunity to meet new members and use other services. If inappropriate or undesirable for you to alter days and times, all is not lost. Warm-ups are recommended to prepare you physiologically and psychologically for more specialised and intense work to follow. Beyond this, warm-ups are designed by preference and practicality.