You can even do these from home!
-Use chairs or bricks in exchange for elevated hurtles on the L-holds
-Use rocks, books, or any heavy and durable item for the drop dead lifts
-Hold a bag filled with items or a jug of water for the V-ups
If you want to make these movements even harder try these tips:
-Do single-leg dead lifts
-Flutter kick while doing L-holds
-Do triceps dips in the L-hold
Add some of these movements to yur daily routine and you will be impressed how quickly you see improvement in your core strength. Start with lower reps and time and work your way up to your goals!