1RM.fit currently lists 1 gym in Kfar Shmaryahu. All of them offer group classes.
Opening at 06:00 or earlier: Sports Club Kfar Shmaryahu (from 06:00). These are the earliest and latest times in the week and they change by day and on holidays, so check the full schedule on each gym's page.
Start from how you actually train. On the Kfar Shmaryahu list, 1 has a pool. Once you have a shortlist, visit at the hour you usually train to see how busy it gets, and check parking and the cancellation or freeze terms before signing.
1RM.fit logs every set, tracks PRs automatically, and works at any gym on this list.