If it is self-funded and unpaid training, then this is compulsory training, and this can be rejected.

If it is paid free training, you must obey the arrangement of the company, because you can't attend it for physical reasons, you can refuse it, because it belongs to the work task.

If you really don't want to participate in the training, you can only apply and get the approval of the leader. As for methods, people can only be moved by emotions.