Isometrics work well on Dense Strength.
Be mindful that you will need to decrease intensity for a given time period to be able to complete all your work.
30-50% of your maximal hold is a good place to aim for.
For Example: If you want to hold for 5 seconds 10D5sec then you would want to be able to hold for 10-15 seconds for a maximal effort.
5 - 10 - 15 or 30 second holds on the minute.
If you want to do 60-second holds you would do minute on, minute off.
Handstands
Dense Strength Handstands work well also.
The longer your work interval the more you eat into your rest so even 5 second jumps are big when you're getting from 20-25-30 second holds!
Enjoy.
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