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I like planks. 
While the usual way to do a plank is on the floor, body supported at feet and elbows, I do them at an angle against the kitchen counter, my desk, or a sturdy table.
I do planks for the front abs (rectus abdominis) and for the sides (obliques).
Plus I do them not as isometrics holding the body rigid for 10 seconds to one minute, but as mini-crunches, with a contracting movement repeated 10-100 times.
Planks btw have helped my golf swing and balance and control while on the bicycle.
While the usual way to do a plank is on the floor, body supported at feet and elbows, I do them at an angle against the kitchen counter, my desk, or a sturdy table.I do planks for the front abs (rectus abdominis) and for the sides (obliques).
Plus I do them not as isometrics holding the body rigid for 10 seconds to one minute, but as mini-crunches, with a contracting movement repeated 10-100 times.
Planks btw have helped my golf swing and balance and control while on the bicycle.