Find out how long the wait is
Ask politely whether the person has much left, without hovering over them. They are entitled to use the equipment. If the venue allows sharing between sets and both people are comfortable with it, that may be an option, but complicated adjustments can make it impractical.
Do not reserve a second station while waiting for the first. A towel placed on empty equipment does not solve the queue; it extends it for someone else. Keep your belongings in a suitable place and follow the gym's rules.
Use the likely wait to make a decision. A brief pause and a long queue need not receive the same response. If you only have a short appointment, knowing an approved alternative is particularly helpful.
A request to work in should be easy to decline. The other person may be following a different arrangement, using a complicated setup or simply prefer not to share. Accept the answer and use another option. Polite communication is useful because it clarifies the wait; it does not create an obligation for someone else to reorganise their workout.
If you do alternate, return adjustments to the agreed position between turns and check the load before your own set. Never assume it remains where you left it. Sharing creates another opportunity for the equipment's setting to change, which makes a deliberate check more important.
Keep alternatives specific
Ask a coach which alternatives fit the purpose of the exercise and your experience. A movement that looks similar online may have a different setup or demand. The right replacement should be something you know how to perform and can use appropriately.
Write the alternative beside the original in your programme. Include any setup note you need. That saves you from searching through videos in the middle of a busy session.
Record the substitute under its own name and load. Do not compare its numbers directly with those from another machine or a free-weight version. Even machines carrying similar labels can differ in how their resistance feels.
Adjust the sequence deliberately
Sometimes another planned exercise can come first. If that is compatible with the programme, make a note of the order change. Later performance should be interpreted with that change in mind, especially when an exercise has moved from the start to the end.
If you have no suitable alternative and cannot wait, omitting one item may be more sensible than attempting unfamiliar equipment. Record the omission and ask how to handle it next time. There is no requirement to fill every minute with a new movement.
Repeated queues are useful feedback about the plan. If the same station is unavailable every Thursday, build a Thursday option rather than experiencing the same surprise each week.
Learn the room's rhythm
Ask staff when the area tends to be quieter. If another time fits your life, test it. A different appointment can change the experience without requiring a new membership or programme.
Still, leave room for variation. Public gyms are shared spaces, and no routine can guarantee that every station will be free. A plan with a few understood choices is more usable than one that depends on the room being arranged entirely around you.