There’s an all mens frum gym called Better Health Studios in boro park.
They have trainers and machines.
Thats the one my husband goes to.
Not familiar with Yeled V’yaldas gym though I know they have a great pool.
Lakewood has a great gym in Shoprite plaza with mens hours. I have relative who goes there every week without fail.
Theres no lack for Kosher Vyosher gyms, maybe some have a lack of interest 😉