The "343": We all know what that number stands for. For many of us not a day goes by we don't think about it. It shaped the future for all of us. Now a workout to honor those fallen heroes.

For time: Beginner
Walk/jog two miles-take a break if needed(two miles is the equivilant to 100 floors)
100 push-ups or push-up variations
100 squats or split up lunges with squats; as long as total reps are 100
43 four-count flutter kicks

Beginner Workout #2: 
Body weight exercises can be very effective. Here is a good one:
Push-ups: 10-20 (number will range depending on person/strength)
Plank: Hold for 30 seconds
Flutter Kicks: 30 total (15 kicks each leg)
Mountain climbers: 40
Repeat 4 times

Beginner Workout #3; "The American":
This workout will push your mental fortitude and heart, but will be well worth it and you will feel like a damn good American Warrior when you're done:
Burpees: 20
Squats: 40
Jump-lunges: 20
Pushups: 20
Crunches: 20
Sprints: 3x's 20 meters
REPEAT 5 TIMES