You might have a weak back and fear the stress weights can put on it.

Often called bodyweight exercises because they only use your body, these moves can tone and sculpt.

Bodyweight exercises take the complication out of strength training and can be done almost anywhere at any time.

Woman stretching

According toSelf, even that may be too much if you’re jumping into strength training without much experience.

If you want to get your heart rate up while building muscle, try burpees.

Jump your legs back into a plank position, hold briefly, and jump back up.

Woman stretching

Mountain climbers also offer a full-body workout.

Again, start in a plank position on your hands and toes.

Then drive each knee toward your chest one at a time.

Woman doing mountain climbers

Your heart rate will increase, adding some cardio from this move.

Start by standing straight with your feet together.

Then, use the balls of your feet to jump side to side.

Woman doing squats

Repeat the move about 20 times and do three reps for best results.

Squat jumps also get your heart rate up while working your glutes and hamstrings.

This high-impact move can be modified by taking the jump out if you have bad knees.

Woman doing a plank

Flutter kicks will activate your lower abdominal muscles.

Lift both legs at a 90-degree angle, then alternate lowering each leg.

However, listen to your body during this exercise.