Source: Stew Smith (Former Navy Seal Trainer & CSCS) http://www.military.com/military-fitness/fitness-test-prep/pt-pyramid

At the bottom, you will find "pullups x 1, pushups x 2, situps x 3". What this means is that at each "set" or step of the pyramid, you perform 1 pullup for every step you are on, 2 pushups for each step, and 3 situps for each step.You start at the bottom of the pyramid, at number one. For each set, you multiply each set number by 1 and that tells you how many pullups to do. You multiply it by 2 to get your pushups, and multiply by 3 for situps. You keep progressing until you get to the top of the pyramid, or your maximum effort at muscle failure. At step six you perform 6 pullups/ 12 pushups/18 situps. Now, you start working your way back down the other side and continue on step 5 on the way back down. So, you'll do 5 pullups/10 pushups/15 situps. Keep going until you work all the way back down to one. Listed below is a number summary of the pyramid:
Go Up the Pyramid - or half pyramid workout:
- Set/Step 1: 1 pullups/2 pushups/3 situps (Warm up)
- Set/Step 2: 2 pullups/4 pushups/6 situps (Warm up)
- Set/Step 3: 3 pullups/6 pushups/9 situps (Warm up)
- Set/Step 4: 4 pullups/8 pushups/12 situps
- Set/Step 5: 5 pullups/10 pushups/15 situps
- Set/Step 6: 6 pullups/12 pushups/18 situps
Go Down the Pyramid - or reverse order pyramid
- Set/Step 5: 5 pullups/10 pushups/15 situps
- Set/Step 4: 4 pullups/8 pushups/12 situps
- Set/Step 3: 3 pullups/6 pushups/9 situps (Cool down)
- Set/Step 2: 2 pullups/4 pushups/6 situps (Cool down)
- Set/Step 1: 1 pullups/2 pushups/3 situps (Cool down)
Other Creative Ideas:
Add: Dips to the exercises for additional triceps/shoulder burn. I usually do the same number of dips as I do pushups.
Add: Run 100 yd. or even 1/4 mile sprints to add a challenging cardio component. These will challenge you tremendously, and you will lose your energy quickly so bring Gatorade for blood sugar/electrolyte replacement and water to drink.