Ankle weights are a simple way to intensify most exercises. You can wear them while you do v-ups, arch ups/rocks/holds, hollow ups/rocks/holds, leg raises at the stahl bars, hug-a-twinkies...everything! Can you get a hold of body weights? Like a weighted weight lifting belt. Those are more convenient than carrying a barbel plate across your shoulders for plyometric exercises. Another way to intensify an exercise is to slow it down. I mean slooow it down. Especially on the negative (usually the "down") part of a movement.
Whatever you do, be consistent. Just keep on conditioning and you'll be in top shape again before you know it!
Good luck! I know conditioning yourself can be hard both discipline and boredom wise.
