I've tried doing HICT complex style in the past, and grip strength was usu the limiting factor, even with straps. You could try doing GM with that 30# chain.
Also, 2 sets of 20 minutes is your ultimate goal. You can start with 1 set of say 12 min and work your way up. Without a HR monitor though, it may be hard to gauge either you're at the appropriate intensity level.
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