The best alternatives to Gymtrack are TieBreak, Zeamo, and gymConsole. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Gymtrack?
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I was sick of dealing with spreadsheets in order to track my workouts and everything else. No tracking app was able to do all of that. I want to log my metrics in a flexible way without losing the ability to create charts from them. => That's gymConsole.
Take control of your workout schedule. Create custom workouts, set schedule reminders, and never skip a workout again. No gym required. Download the iOS App here: https://apps.apple.com/us/app/traen/id1529673549